21851507150 has 24 divisors (see below), whose sum is σ = 44338695624. Its totient is φ = 7946002400.

The previous prime is 21851507147. The next prime is 21851507173. The reversal of 21851507150 is 5170515812.

It is a super-2 number, since 2×21851507150² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21851507150.

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, 19864457 + ... + 19865556.

It is an arithmetic number, because the mean of its divisors is an integer number (1847445651).

Almost surely, 2^21851507150 is an apocalyptic number.

21851507150 is an abundant number, since it is smaller than the sum of its proper divisors (22487188474).

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

21851507150 is a wasteful number, since it uses less digits than its factorization.

21851507150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39730036 (or 39730031 counting only the distinct ones).

The product of its (nonzero) digits is 14000, while the sum is 35.

The spelling of 21851507150 in words is "twenty-one billion, eight hundred fifty-one million, five hundred seven thousand, one hundred fifty".