21131331076 has 12 divisors (see below), whose sum is σ = 36993892572. Its totient is φ = 10561647488.

The previous prime is 21131331073. The next prime is 21131331077. The reversal of 21131331076 is 67013313112.

It can be written as a sum of positive squares in 2 ways, for example, as 1829786176 + 19301544900 = 42776^2 + 138930^2 .

It is not an unprimeable number, because it can be changed into a prime (21131331073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 992665 + ... + 1013728.

It is an arithmetic number, because the mean of its divisors is an integer number (3082824381).

Almost surely, 2^21131331076 is an apocalyptic number.

It is an amenable number.

21131331076 is a deficient number, since it is larger than the sum of its proper divisors (15862561496).

21131331076 is a wasteful number, since it uses less digits than its factorization.

21131331076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2009030 (or 2009028 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 28.

Adding to 21131331076 its reverse (67013313112), we get a palindrome (88144644188).

The spelling of 21131331076 in words is "twenty-one billion, one hundred thirty-one million, three hundred thirty-one thousand, seventy-six".