21066604356 has 48 divisors (see below), whose sum is σ = 56290304000. Its totient is φ = 6006955680.

The previous prime is 21066604343. The next prime is 21066604393. The reversal of 21066604356 is 65340666012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209380 + ... + 293211.

Almost surely, 2^21066604356 is an apocalyptic number.

It is an amenable number.

21066604356 is an abundant number, since it is smaller than the sum of its proper divisors (35223699644).

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

21066604356 is a wasteful number, since it uses less digits than its factorization.

21066604356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503104 (or 503102 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

The spelling of 21066604356 in words is "twenty-one billion, sixty-six million, six hundred four thousand, three hundred fifty-six".