21113002131 has 16 divisors (see below), whose sum is σ = 30323731200. Its totient is φ = 12989348640.

The previous prime is 21113002091. The next prime is 21113002133. The reversal of 21113002131 is 13120031112.

It is a happy number.

It is not a de Polignac number, because 21113002131 - 2¹⁵ = 21112969363 is a prime.

It is a super-2 number, since 2×21113002131² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21113002131.

It is not an unprimeable number, because it can be changed into a prime (21113002133) 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, 93826 + ... + 225896.

It is an arithmetic number, because the mean of its divisors is an integer number (1895233200).

Almost surely, 2^21113002131 is an apocalyptic number.

21113002131 is a deficient number, since it is larger than the sum of its proper divisors (9210729069).

21113002131 is a wasteful number, since it uses less digits than its factorization.

21113002131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136186.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21113002131 its reverse (13120031112), we get a palindrome (34233033243).

The spelling of 21113002131 in words is "twenty-one billion, one hundred thirteen million, two thousand, one hundred thirty-one".