21017061052 has 36 divisors (see below), whose sum is σ = 41922877080. Its totient is φ = 9189640512.

The previous prime is 21017061001. The next prime is 21017061077. The reversal of 21017061052 is 25016071012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 805323 + ... + 831010.

Almost surely, 2^21017061052 is an apocalyptic number.

It is an amenable number.

21017061052 is a deficient number, since it is larger than the sum of its proper divisors (20905816028).

21017061052 is a wasteful number, since it uses less digits than its factorization.

21017061052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636382 (or 1636367 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 25.

The spelling of 21017061052 in words is "twenty-one billion, seventeen million, sixty-one thousand, fifty-two".