21642615030 has 96 divisors (see below), whose sum is σ = 54091787040. Its totient is φ = 5535416320.

The previous prime is 21642615023. The next prime is 21642615053. The reversal of 21642615030 is 3051624612.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33763510 + ... + 33764150.

It is an arithmetic number, because the mean of its divisors is an integer number (563456115).

Almost surely, 2^21642615030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21642615030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27045893520).

21642615030 is an abundant number, since it is smaller than the sum of its proper divisors (32449172010).

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

21642615030 is a wasteful number, since it uses less digits than its factorization.

21642615030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074 (or 877 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The spelling of 21642615030 in words is "twenty-one billion, six hundred forty-two million, six hundred fifteen thousand, thirty".