1231301223021 has 32 divisors (see below), whose sum is σ = 1741054694400. Its totient is φ = 772670154240.

The previous prime is 1231301223017. The next prime is 1231301223041. The reversal of 1231301223021 is 1203221031321.

It is not a de Polignac number, because 1231301223021 - 2² = 1231301223017 is a prime.

It is a super-2 number, since 2×1231301223021² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231301223001) 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, 10986415 + ... + 11097923.

It is an arithmetic number, because the mean of its divisors is an integer number (54407959200).

Almost surely, 2^{1231301223021} is an apocalyptic number.

It is an amenable number.

1231301223021 is a deficient number, since it is larger than the sum of its proper divisors (509753471379).

1231301223021 is a wasteful number, since it uses less digits than its factorization.

1231301223021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114789.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 1231301223021 its reverse (1203221031321), we get a palindrome (2434522254342).

The spelling of 1231301223021 in words is "one trillion, two hundred thirty-one billion, three hundred one million, two hundred twenty-three thousand, twenty-one".