21131131014 has 64 divisors (see below), whose sum is σ = 53683929600. Its totient is φ = 6035490144.

The previous prime is 21131131001. The next prime is 21131131057. The reversal of 21131131014 is 41013113112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1458297 + ... + 1472715.

It is an arithmetic number, because the mean of its divisors is an integer number (838811400).

Almost surely, 2^21131131014 is an apocalyptic number.

21131131014 is an abundant number, since it is smaller than the sum of its proper divisors (32552798586).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21131131014 is a wasteful number, since it uses less digits than its factorization.

21131131014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18314 (or 18308 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 21131131014 its reverse (41013113112), we get a palindrome (62144244126).

The spelling of 21131131014 in words is "twenty-one billion, one hundred thirty-one million, one hundred thirty-one thousand, fourteen".