21113031076 has 6 divisors (see below), whose sum is σ = 36947804390. Its totient is φ = 10556515536.

The previous prime is 21113030959. The next prime is 21113031077. The reversal of 21113031076 is 67013031112.

It can be written as a sum of positive squares in only one way, i.e., 15040569600 + 6072461476 = 122640^2 + 77926^2 .

It is a super-2 number, since 2×21113031076² (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 21113031076.

It is not an unprimeable number, because it can be changed into a prime (21113031077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2639128881 + ... + 2639128888.

Almost surely, 2^21113031076 is an apocalyptic number.

It is an amenable number.

21113031076 is a deficient number, since it is larger than the sum of its proper divisors (15834773314).

21113031076 is a wasteful number, since it uses less digits than its factorization.

21113031076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5278257773 (or 5278257771 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 25.

Adding to 21113031076 its reverse (67013031112), we get a palindrome (88126062188).

The spelling of 21113031076 in words is "twenty-one billion, one hundred thirteen million, thirty-one thousand, seventy-six".