1221003113231 has 64 divisors (see below), whose sum is σ = 1535592038400. Its totient is φ = 955849766400.

The previous prime is 1221003113227. The next prime is 1221003113233. The reversal of 1221003113231 is 1323113001221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1221003113231 - 2² = 1221003113227 is a prime.

It is a super-2 number, since 2×1221003113231² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221003113233) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 55390910 + ... + 55412948.

It is an arithmetic number, because the mean of its divisors is an integer number (23993625600).

Almost surely, 2^{1221003113231} is an apocalyptic number.

1221003113231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221003113231 is a deficient number, since it is larger than the sum of its proper divisors (314588925169).

1221003113231 is a wasteful number, since it uses less digits than its factorization.

1221003113231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22620.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1221003113231 its reverse (1323113001221), we get a palindrome (2544116114452).

The spelling of 1221003113231 in words is "one trillion, two hundred twenty-one billion, three million, one hundred thirteen thousand, two hundred thirty-one".