21917490074 has 24 divisors (see below), whose sum is σ = 35198999040. Its totient is φ = 10232865216.

The previous prime is 21917490061. The next prime is 21917490131. The reversal of 21917490074 is 47009471912.

It is a super-2 number, since 2×21917490074² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75884 + ... + 222695.

It is an arithmetic number, because the mean of its divisors is an integer number (1466624960).

Almost surely, 2^21917490074 is an apocalyptic number.

21917490074 is a deficient number, since it is larger than the sum of its proper divisors (13281508966).

21917490074 is a wasteful number, since it uses less digits than its factorization.

21917490074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298742 (or 298725 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 44.

The spelling of 21917490074 in words is "twenty-one billion, nine hundred seventeen million, four hundred ninety thousand, seventy-four".