21321231120131 has 16 divisors (see below), whose sum is σ = 21726137000448. Its totient is φ = 20919250598400.

The previous prime is 21321231120109. The next prime is 21321231120197. The reversal of 21321231120131 is 13102113212312.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21321231120131 is a prime.

It is a super-2 number, since 2×21321231120131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21321231120097 and 21321231120106.

It is not an unprimeable number, because it can be changed into a prime (21321231170131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165430691 + ... + 165559523.

It is an arithmetic number, because the mean of its divisors is an integer number (1357883562528).

Almost surely, 2^{21321231120131} is an apocalyptic number.

21321231120131 is a deficient number, since it is larger than the sum of its proper divisors (404905880317).

21321231120131 is a wasteful number, since it uses less digits than its factorization.

21321231120131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140162.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 21321231120131 its reverse (13102113212312), we get a palindrome (34423344332443).

The spelling of 21321231120131 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred thirty-one million, one hundred twenty thousand, one hundred thirty-one".