21301937 has 2 divisors, whose sum is σ = 21301938. Its totient is φ = 21301936.

The previous prime is 21301877. The next prime is 21301949. The reversal of 21301937 is 73910312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14167696 + 7134241 = 3764^2 + 2671^2 .

It is a cyclic number.

It is not a de Polignac number, because 21301937 - 2⁶ = 21301873 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21301957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650968 + 10650969.

It is an arithmetic number, because the mean of its divisors is an integer number (10650969).

Almost surely, 2^21301937 is an apocalyptic number.

It is an amenable number.

21301937 is a deficient number, since it is larger than the sum of its proper divisors (1).

21301937 is an equidigital number, since it uses as much as digits as its factorization.

21301937 is an evil number, because the sum of its binary digits is even.

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

The square root of 21301937 is about 4615.4021493257. The cubic root of 21301937 is about 277.2083866803.

The spelling of 21301937 in words is "twenty-one million, three hundred one thousand, nine hundred thirty-seven".