21083000056 has 32 divisors (see below), whose sum is σ = 41497459200. Its totient is φ = 10028538720.

The previous prime is 21083000053. The next prime is 21083000069. The reversal of 21083000056 is 65000038012.

It is a happy number.

It is a super-2 number, since 2×21083000056² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21083000051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 705810 + ... + 735073.

It is an arithmetic number, because the mean of its divisors is an integer number (1296795600).

Almost surely, 2^21083000056 is an apocalyptic number.

It is an amenable number.

21083000056 is a deficient number, since it is larger than the sum of its proper divisors (20414459144).

21083000056 is a wasteful number, since it uses less digits than its factorization.

21083000056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1440979 (or 1440975 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 21083000056 its reverse (65000038012), we get a palindrome (86083038068).

The spelling of 21083000056 in words is "twenty-one billion, eighty-three million, fifty-six", and thus it is an aban number and an uban number.