21625018250 has 32 divisors (see below), whose sum is σ = 44162224704. Its totient is φ = 7863642000.

The previous prime is 21625018241. The next prime is 21625018297. The reversal of 21625018250 is 5281052612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3929072 + ... + 3934571.

It is an arithmetic number, because the mean of its divisors is an integer number (1380069522).

Almost surely, 2^21625018250 is an apocalyptic number.

21625018250 is an abundant number, since it is smaller than the sum of its proper divisors (22537206454).

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

21625018250 is a wasteful number, since it uses less digits than its factorization.

21625018250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7863671 (or 7863661 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The spelling of 21625018250 in words is "twenty-one billion, six hundred twenty-five million, eighteen thousand, two hundred fifty".