21073436982 has 64 divisors (see below), whose sum is σ = 51287040000. Its totient is φ = 6374221344.

The previous prime is 21073436957. The next prime is 21073436983. The reversal of 21073436982 is 28963437012.

21073436982 is a `hidden beast` number, since 210 + 7 + 343 + 6 + 98 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21073436983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 212982 + ... + 295817.

It is an arithmetic number, because the mean of its divisors is an integer number (801360000).

Almost surely, 2^21073436982 is an apocalyptic number.

21073436982 is an abundant number, since it is smaller than the sum of its proper divisors (30213603018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21073436982 is a wasteful number, since it uses less digits than its factorization.

21073436982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508882 (or 508876 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The spelling of 21073436982 in words is "twenty-one billion, seventy-three million, four hundred thirty-six thousand, nine hundred eighty-two".