21555251150 has 24 divisors (see below), whose sum is σ = 42451166880. Its totient is φ = 8114917760.

The previous prime is 21555251147. The next prime is 21555251161. The reversal of 21555251150 is 5115255512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12678710 + ... + 12680409.

It is an arithmetic number, because the mean of its divisors is an integer number (1768798620).

Almost surely, 2^21555251150 is an apocalyptic number.

21555251150 is a deficient number, since it is larger than the sum of its proper divisors (20895915730).

21555251150 is a wasteful number, since it uses less digits than its factorization.

21555251150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25359148 (or 25359143 counting only the distinct ones).

The product of its (nonzero) digits is 12500, while the sum is 32.

The spelling of 21555251150 in words is "twenty-one billion, five hundred fifty-five million, two hundred fifty-one thousand, one hundred fifty".