21657470030 has 32 divisors (see below), whose sum is σ = 45393130944. Its totient is φ = 7285314816.

The previous prime is 21657470011. The next prime is 21657470041. The reversal of 21657470030 is 3007475612.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

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, 2915087 + ... + 2922506.

It is an arithmetic number, because the mean of its divisors is an integer number (1418535342).

Almost surely, 2^21657470030 is an apocalyptic number.

21657470030 is an abundant number, since it is smaller than the sum of its proper divisors (23735660914).

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

21657470030 is a wasteful number, since it uses less digits than its factorization.

21657470030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5837660.

The product of its (nonzero) digits is 35280, while the sum is 35.

The spelling of 21657470030 in words is "twenty-one billion, six hundred fifty-seven million, four hundred seventy thousand, thirty".