21005052150 has 24 divisors (see below), whose sum is σ = 52092529704. Its totient is φ = 5601347200.

The previous prime is 21005052149. The next prime is 21005052191. The reversal of 21005052150 is 5125050012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70016691 + ... + 70016990.

It is an arithmetic number, because the mean of its divisors is an integer number (2170522071).

Almost surely, 2^21005052150 is an apocalyptic number.

21005052150 is an abundant number, since it is smaller than the sum of its proper divisors (31087477554).

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

21005052150 is a wasteful number, since it uses less digits than its factorization.

21005052150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140033696 (or 140033691 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 21.

The spelling of 21005052150 in words is "twenty-one billion, five million, fifty-two thousand, one hundred fifty".