21376937 has 2 divisors, whose sum is σ = 21376938. Its totient is φ = 21376936.

The previous prime is 21376933. The next prime is 21376951. The reversal of 21376937 is 73967312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16128256 + 5248681 = 4016^2 + 2291^2 .

It is a cyclic number.

It is not a de Polignac number, because 21376937 - 2² = 21376933 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21376937.

It is not a weakly prime, because it can be changed into another prime (21376931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10688468 + 10688469.

It is an arithmetic number, because the mean of its divisors is an integer number (10688469).

Almost surely, 2^21376937 is an apocalyptic number.

It is an amenable number.

21376937 is a deficient number, since it is larger than the sum of its proper divisors (1).

21376937 is an equidigital number, since it uses as much as digits as its factorization.

21376937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47628, while the sum is 38.

The square root of 21376937 is about 4623.5199794096. The cubic root of 21376937 is about 277.5333379854.

The spelling of 21376937 in words is "twenty-one million, three hundred seventy-six thousand, nine hundred thirty-seven".