21374405973 has 6 divisors (see below), whose sum is σ = 30874141974. Its totient is φ = 14249603976.

The previous prime is 21374405971. The next prime is 21374405993. The reversal of 21374405973 is 37950447312.

21374405973 is a `hidden beast` number, since 2 + 13 + 7 + 4 + 40 + 597 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13924472004 + 7449933969 = 118002^2 + 86313^2 .

It is not a de Polignac number, because 21374405973 - 2¹ = 21374405971 is a prime.

It is a Curzon number.

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 5 ways as a sum of consecutive naturals, for example, 1187466990 + ... + 1187467007.

It is an arithmetic number, because the mean of its divisors is an integer number (5145690329).

Almost surely, 2^21374405973 is an apocalyptic number.

It is an amenable number.

21374405973 is a deficient number, since it is larger than the sum of its proper divisors (9499736001).

21374405973 is a wasteful number, since it uses less digits than its factorization.

21374405973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2374934003 (or 2374934000 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 45.

The spelling of 21374405973 in words is "twenty-one billion, three hundred seventy-four million, four hundred five thousand, nine hundred seventy-three".