1221004340031 has 32 divisors (see below), whose sum is σ = 1898941478400. Its totient is φ = 697572539328.

The previous prime is 1221004339987. The next prime is 1221004340041. The reversal of 1221004340031 is 1300434001221.

It is not a de Polignac number, because 1221004340031 - 2⁷ = 1221004339903 is a prime.

It is a super-2 number, since 2×1221004340031² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221004340041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4960000 + ... + 5200346.

It is an arithmetic number, because the mean of its divisors is an integer number (59341921200).

Almost surely, 2^{1221004340031} is an apocalyptic number.

1221004340031 is a deficient number, since it is larger than the sum of its proper divisors (677937138369).

1221004340031 is an equidigital number, since it uses as much as digits as its factorization.

1221004340031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245308 (or 245294 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 1221004340031 its reverse (1300434001221), we get a palindrome (2521438341252).

The spelling of 1221004340031 in words is "one trillion, two hundred twenty-one billion, four million, three hundred forty thousand, thirty-one".