21117041550 has 96 divisors (see below), whose sum is σ = 63479151360. Its totient is φ = 5119279200.

The previous prime is 21117041531. The next prime is 21117041593. The reversal of 21117041550 is 5514071112.

21117041550 is a `hidden beast` number, since 2 + 1 + 1 + 1 + 70 + 41 + 550 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 696162 + ... + 725861.

It is an arithmetic number, because the mean of its divisors is an integer number (661241160).

Almost surely, 2^21117041550 is an apocalyptic number.

21117041550 is an abundant number, since it is smaller than the sum of its proper divisors (42362109810).

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

21117041550 is a wasteful number, since it uses less digits than its factorization.

21117041550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1422055 (or 1422044 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 27.

The spelling of 21117041550 in words is "twenty-one billion, one hundred seventeen million, forty-one thousand, five hundred fifty".