21116172074 has 16 divisors (see below), whose sum is σ = 33222664512. Its totient is φ = 10046707968.

The previous prime is 21116172047. The next prime is 21116172167. The reversal of 21116172074 is 47027161112.

It is a super-2 number, since 2×21116172074² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21116172074.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1180364 + ... + 1198119.

It is an arithmetic number, because the mean of its divisors is an integer number (2076416532).

Almost surely, 2^21116172074 is an apocalyptic number.

21116172074 is a deficient number, since it is larger than the sum of its proper divisors (12106492438).

21116172074 is a wasteful number, since it uses less digits than its factorization.

21116172074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2378701.

The product of its (nonzero) digits is 4704, while the sum is 32.

The spelling of 21116172074 in words is "twenty-one billion, one hundred sixteen million, one hundred seventy-two thousand, seventy-four".