1221232415121 has 24 divisors (see below), whose sum is σ = 1866623481216. Its totient is φ = 767788486080.

The previous prime is 1221232415119. The next prime is 1221232415131. The reversal of 1221232415121 is 1215142321221.

1221232415121 is a `hidden beast` number, since 1 + 2 + 2 + 1 + 232 + 415 + 12 + 1 = 666.

It is not a de Polignac number, because 1221232415121 - 2¹ = 1221232415119 is a prime.

It is a super-2 number, since 2×1221232415121² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221232415131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41532300 + ... + 41561693.

It is an arithmetic number, because the mean of its divisors is an integer number (77775978384).

Almost surely, 2^{1221232415121} is an apocalyptic number.

It is an amenable number.

1221232415121 is a deficient number, since it is larger than the sum of its proper divisors (645391066095).

1221232415121 is a wasteful number, since it uses less digits than its factorization.

1221232415121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83094093 (or 83094090 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

Adding to 1221232415121 its reverse (1215142321221), we get a palindrome (2436374736342).

The spelling of 1221232415121 in words is "one trillion, two hundred twenty-one billion, two hundred thirty-two million, four hundred fifteen thousand, one hundred twenty-one".