21131331035 has 16 divisors (see below), whose sum is σ = 26088677472. Its totient is φ = 16419283200.

The previous prime is 21131330963. The next prime is 21131331073. The reversal of 21131331035 is 53013313112.

It is not a de Polignac number, because 21131331035 - 2¹² = 21131326939 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21131331035.

It is an unprimeable number.

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, 5615 + ... + 205655.

It is an arithmetic number, because the mean of its divisors is an integer number (1630542342).

Almost surely, 2^21131331035 is an apocalyptic number.

21131331035 is a deficient number, since it is larger than the sum of its proper divisors (4957346437).

21131331035 is a wasteful number, since it uses less digits than its factorization.

21131331035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200654.

The product of its (nonzero) digits is 810, while the sum is 23.

Adding to 21131331035 its reverse (53013313112), we get a palindrome (74144644147).

The spelling of 21131331035 in words is "twenty-one billion, one hundred thirty-one million, three hundred thirty-one thousand, thirty-five".