21925637 has 2 divisors, whose sum is σ = 21925638. Its totient is φ = 21925636.

The previous prime is 21925627. The next prime is 21925663. The reversal of 21925637 is 73652912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17255716 + 4669921 = 4154^2 + 2161^2 .

It is a cyclic number.

It is not a de Polignac number, because 21925637 - 2⁶ = 21925573 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21925597 and 21925606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21925627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10962818 + 10962819.

It is an arithmetic number, because the mean of its divisors is an integer number (10962819).

Almost surely, 2^21925637 is an apocalyptic number.

It is an amenable number.

21925637 is a deficient number, since it is larger than the sum of its proper divisors (1).

21925637 is an equidigital number, since it uses as much as digits as its factorization.

21925637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 35.

The square root of 21925637 is about 4682.4819273543. The cubic root of 21925637 is about 279.8878675149.

The spelling of 21925637 in words is "twenty-one million, nine hundred twenty-five thousand, six hundred thirty-seven".