21213403131 has 24 divisors (see below), whose sum is σ = 30144452800. Its totient is φ = 13266847872.

The previous prime is 21213403121. The next prime is 21213403139. The reversal of 21213403131 is 13130431212.

It is not a de Polignac number, because 21213403131 - 2⁶ = 21213403067 is a prime.

It is a super-5 number, since 5×21213403131⁵ (a number of 53 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 21213403098 and 21213403107.

It is not an unprimeable number, because it can be changed into a prime (21213403139) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 226320 + ... + 306018.

Almost surely, 2^21213403131 is an apocalyptic number.

21213403131 is a deficient number, since it is larger than the sum of its proper divisors (8931049669).

21213403131 is a wasteful number, since it uses less digits than its factorization.

21213403131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80043 (or 80026 counting only the distinct ones).

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

Adding to 21213403131 its reverse (13130431212), we get a palindrome (34343834343).

The spelling of 21213403131 in words is "twenty-one billion, two hundred thirteen million, four hundred three thousand, one hundred thirty-one".