21012214131 has 28 divisors (see below), whose sum is σ = 31798456632. Its totient is φ = 13877174016.

The previous prime is 21012214087. The next prime is 21012214169. The reversal of 21012214131 is 13141221012.

It is not a de Polignac number, because 21012214131 - 2¹⁵ = 21012181363 is a prime.

It is a super-2 number, since 2×21012214131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21012214231) 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 27 ways as a sum of consecutive naturals, for example, 56686 + ... + 212691.

Almost surely, 2^21012214131 is an apocalyptic number.

21012214131 is a deficient number, since it is larger than the sum of its proper divisors (10786242501).

21012214131 is an equidigital number, since it uses as much as digits as its factorization.

21012214131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269502 (or 269487 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21012214131 its reverse (13141221012), we get a palindrome (34153435143).

The spelling of 21012214131 in words is "twenty-one billion, twelve million, two hundred fourteen thousand, one hundred thirty-one".