21937061 has 2 divisors, whose sum is σ = 21937062. Its totient is φ = 21937060.

The previous prime is 21937049. The next prime is 21937063. The reversal of 21937061 is 16073912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11600836 + 10336225 = 3406^2 + 3215^2 .

It is a cyclic number.

It is not a de Polignac number, because 21937061 - 2¹⁰ = 21936037 is a prime.

Together with 21937063, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1385534 and since 21937061 and 1385534 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21937063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10968530 + 10968531.

It is an arithmetic number, because the mean of its divisors is an integer number (10968531).

Almost surely, 2^21937061 is an apocalyptic number.

It is an amenable number.

21937061 is a deficient number, since it is larger than the sum of its proper divisors (1).

21937061 is an equidigital number, since it uses as much as digits as its factorization.

21937061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 21937061 is about 4683.7016343913. The cubic root of 21937061 is about 279.9364694299.

The spelling of 21937061 in words is "twenty-one million, nine hundred thirty-seven thousand, sixty-one".