21321421131 has 16 divisors (see below), whose sum is σ = 30153039264. Its totient is φ = 13354942464.

The previous prime is 21321421127. The next prime is 21321421133. The reversal of 21321421131 is 13112412312.

It is not a de Polignac number, because 21321421131 - 2² = 21321421127 is a prime.

It is a super-2 number, since 2×21321421131² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21321421098 and 21321421107.

It is not an unprimeable number, because it can be changed into a prime (21321421133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 332850 + ... + 391703.

It is an arithmetic number, because the mean of its divisors is an integer number (1884564954).

Almost surely, 2^21321421131 is an apocalyptic number.

21321421131 is a deficient number, since it is larger than the sum of its proper divisors (8831618133).

21321421131 is a wasteful number, since it uses less digits than its factorization.

21321421131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725150.

The product of its digits is 288, while the sum is 21.

Adding to 21321421131 its reverse (13112412312), we get a palindrome (34433833443).

The spelling of 21321421131 in words is "twenty-one billion, three hundred twenty-one million, four hundred twenty-one thousand, one hundred thirty-one".