21103937 has 2 divisors, whose sum is σ = 21103938. Its totient is φ = 21103936.

The previous prime is 21103933. The next prime is 21103961. The reversal of 21103937 is 73930112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16613776 + 4490161 = 4076^2 + 2119^2 .

It is a cyclic number.

It is not a de Polignac number, because 21103937 - 2² = 21103933 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21103933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551968 + 10551969.

It is an arithmetic number, because the mean of its divisors is an integer number (10551969).

Almost surely, 2^21103937 is an apocalyptic number.

It is an amenable number.

21103937 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103937 is an equidigital number, since it uses as much as digits as its factorization.

21103937 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 21103937 is about 4593.9021539428. The cubic root of 21103937 is about 276.3468343258.

The spelling of 21103937 in words is "twenty-one million, one hundred three thousand, nine hundred thirty-seven".