21874037 has 2 divisors, whose sum is σ = 21874038. Its totient is φ = 21874036.

The previous prime is 21874009. The next prime is 21874043. The reversal of 21874037 is 73047812.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18028516 + 3845521 = 4246^2 + 1961^2 .

It is a cyclic number.

It is not a de Polignac number, because 21874037 - 2¹⁴ = 21857653 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21873994 and 21874012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21874537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10937018 + 10937019.

It is an arithmetic number, because the mean of its divisors is an integer number (10937019).

Almost surely, 2^21874037 is an apocalyptic number.

It is an amenable number.

21874037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21874037 is an equidigital number, since it uses as much as digits as its factorization.

21874037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 21874037 is about 4676.9687833040. The cubic root of 21874037 is about 279.6681314698.

The spelling of 21874037 in words is "twenty-one million, eight hundred seventy-four thousand, thirty-seven".