21887716530 has 32 divisors (see below), whose sum is σ = 52608622464. Its totient is φ = 5828046336.

The previous prime is 21887716507. The next prime is 21887716531. The reversal of 21887716530 is 3561778812.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21887716530.

It is not an unprimeable number, because it can be changed into a prime (21887716531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 521854 + ... + 562233.

It is an arithmetic number, because the mean of its divisors is an integer number (1644019452).

Almost surely, 2^21887716530 is an apocalyptic number.

21887716530 is an abundant number, since it is smaller than the sum of its proper divisors (30720905934).

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

21887716530 is a wasteful number, since it uses less digits than its factorization.

21887716530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1084770.

The product of its (nonzero) digits is 564480, while the sum is 48.

The spelling of 21887716530 in words is "twenty-one billion, eight hundred eighty-seven million, seven hundred sixteen thousand, five hundred thirty".