21083618812 has 24 divisors (see below), whose sum is σ = 38867875200. Its totient is φ = 9979358256.

The previous prime is 21083618797. The next prime is 21083618819. The reversal of 21083618812 is 21881638012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21083618819) 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, 4918 + ... + 205405.

It is an arithmetic number, because the mean of its divisors is an integer number (1619494800).

Almost surely, 2^21083618812 is an apocalyptic number.

It is an amenable number.

21083618812 is a deficient number, since it is larger than the sum of its proper divisors (17784256388).

21083618812 is a wasteful number, since it uses less digits than its factorization.

21083618812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211665 (or 211663 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 40.

The spelling of 21083618812 in words is "twenty-one billion, eighty-three million, six hundred eighteen thousand, eight hundred twelve".