20121110201221 has 8 divisors (see below), whose sum is σ = 20905836535800. Its totient is φ = 19342443529920.

The previous prime is 20121110201209. The next prime is 20121110201233. The reversal of 20121110201221 is 12210201112102.

It is an interprime number because it is at equal distance from previous prime (20121110201209) and next prime (20121110201233).

It can be written as a sum of positive squares in 4 ways, for example, as 2583860138721 + 17537250062500 = 1607439^2 + 4187750^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20121110201221 - 2⁴³ = 11325017179013 is a prime.

It is a super-2 number, since 2×20121110201221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20121110201195 and 20121110201204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121110201821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1514909050 + ... + 1514922331.

It is an arithmetic number, because the mean of its divisors is an integer number (2613229566975).

Almost surely, 2^{20121110201221} is an apocalyptic number.

It is an amenable number.

20121110201221 is a deficient number, since it is larger than the sum of its proper divisors (784726334579).

20121110201221 is a wasteful number, since it uses less digits than its factorization.

20121110201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3029831639.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20121110201221 its reverse (12210201112102), we get a palindrome (32331311313323).

The spelling of 20121110201221 in words is "twenty trillion, one hundred twenty-one billion, one hundred ten million, two hundred one thousand, two hundred twenty-one".