1221112020121 has 8 divisors (see below), whose sum is σ = 1409373987264. Its totient is φ = 1036304401200.

The previous prime is 1221112020097. The next prime is 1221112020143. The reversal of 1221112020121 is 1210202111221.

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 1221112020121 - 2¹³ = 1221112011929 is a prime.

It is a super-2 number, since 2×1221112020121² (a number of 25 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 = 1221112020095 and 1221112020104.

It is not an unprimeable number, because it can be changed into a prime (1221112020181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 863586295 + ... + 863587708.

It is an arithmetic number, because the mean of its divisors is an integer number (176171748408).

Almost surely, 2^{1221112020121} is an apocalyptic number.

It is an amenable number.

1221112020121 is a deficient number, since it is larger than the sum of its proper divisors (188261967143).

1221112020121 is a wasteful number, since it uses less digits than its factorization.

1221112020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1727174111.

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

Adding to 1221112020121 its reverse (1210202111221), we get a palindrome (2431314131342).

The spelling of 1221112020121 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, twenty thousand, one hundred twenty-one".