131211221200421 has 32 divisors (see below), whose sum is σ = 139082845440000. Its totient is φ = 123621867835200.

The previous prime is 131211221200387. The next prime is 131211221200427. The reversal of 131211221200421 is 124002122112131.

It is a cyclic number.

It is not a de Polignac number, because 131211221200421 - 2³⁴ = 131194041331237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131211221200427) 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, 119333000 + ... + 120427518.

It is an arithmetic number, because the mean of its divisors is an integer number (4346338920000).

Almost surely, 2^{131211221200421} is an apocalyptic number.

It is an amenable number.

131211221200421 is a deficient number, since it is larger than the sum of its proper divisors (7871624239579).

131211221200421 is a wasteful number, since it uses less digits than its factorization.

131211221200421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095249.

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 131211221200421 its reverse (124002122112131), we get a palindrome (255213343312552).

The spelling of 131211221200421 in words is "one hundred thirty-one trillion, two hundred eleven billion, two hundred twenty-one million, two hundred thousand, four hundred twenty-one".