21374405974 has 16 divisors (see below), whose sum is σ = 32119507440. Its totient is φ = 10667923200.

The previous prime is 21374405971. The next prime is 21374405993. The reversal of 21374405974 is 47950447312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21374405971) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2861857 + ... + 2869315.

It is an arithmetic number, because the mean of its divisors is an integer number (2007469215).

Almost surely, 2^21374405974 is an apocalyptic number.

21374405974 is a deficient number, since it is larger than the sum of its proper divisors (10745101466).

21374405974 is a wasteful number, since it uses less digits than its factorization.

21374405974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9855.

The product of its (nonzero) digits is 846720, while the sum is 46.

The spelling of 21374405974 in words is "twenty-one billion, three hundred seventy-four million, four hundred five thousand, nine hundred seventy-four".