20121011111221 has 8 divisors (see below), whose sum is σ = 20165071687488. Its totient is φ = 20076963060000.

The previous prime is 20121011111119. The next prime is 20121011111231. The reversal of 20121011111221 is 12211111012102.

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 20121011111221 - 2¹⁷ = 20121010980149 is a prime.

It is a super-2 number, since 2×20121011111221² (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 = 20121011111195 and 20121011111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121011111231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88801 + ... + 6344281.

It is an arithmetic number, because the mean of its divisors is an integer number (2520633960936).

Almost surely, 2^{20121011111221} is an apocalyptic number.

It is an amenable number.

20121011111221 is a deficient number, since it is larger than the sum of its proper divisors (44060576267).

20121011111221 is an equidigital number, since it uses as much as digits as its factorization.

20121011111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6262523.

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

Adding to 20121011111221 its reverse (12211111012102), we get a palindrome (32332122123323).

The spelling of 20121011111221 in words is "twenty trillion, one hundred twenty-one billion, eleven million, one hundred eleven thousand, two hundred twenty-one".