21166883250 has 32 divisors (see below), whose sum is σ = 52832542464. Its totient is φ = 5644502000.

The previous prime is 21166883237. The next prime is 21166883323. The reversal of 21166883250 is 5238866112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14110506 + ... + 14112005.

It is an arithmetic number, because the mean of its divisors is an integer number (1651016952).

Almost surely, 2^21166883250 is an apocalyptic number.

21166883250 is an abundant number, since it is smaller than the sum of its proper divisors (31665659214).

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

21166883250 is a wasteful number, since it uses less digits than its factorization.

21166883250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28222531 (or 28222521 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The spelling of 21166883250 in words is "twenty-one billion, one hundred sixty-six million, eight hundred eighty-three thousand, two hundred fifty".