21125175150 has 48 divisors (see below), whose sum is σ = 52909189488. Its totient is φ = 5577600000.

The previous prime is 21125175139. The next prime is 21125175157. The reversal of 21125175150 is 5157152112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21125175157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 682051 + ... + 712350.

It is an arithmetic number, because the mean of its divisors is an integer number (1102274781).

Almost surely, 2^21125175150 is an apocalyptic number.

21125175150 is an abundant number, since it is smaller than the sum of its proper divisors (31784014338).

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

21125175150 is a wasteful number, since it uses less digits than its factorization.

21125175150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1394517 (or 1394512 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 30.

The spelling of 21125175150 in words is "twenty-one billion, one hundred twenty-five million, one hundred seventy-five thousand, one hundred fifty".