21001533250 has 64 divisors (see below), whose sum is σ = 40307439744. Its totient is φ = 8189294400.

The previous prime is 21001533239. The next prime is 21001533277. The reversal of 21001533250 is 5233510012.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 6588157 + ... + 6591343.

It is an arithmetic number, because the mean of its divisors is an integer number (629803746).

Almost surely, 2^21001533250 is an apocalyptic number.

21001533250 is a deficient number, since it is larger than the sum of its proper divisors (19305906494).

21001533250 is a wasteful number, since it uses less digits than its factorization.

21001533250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3860 (or 3850 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

The spelling of 21001533250 in words is "twenty-one billion, one million, five hundred thirty-three thousand, two hundred fifty".