21892037 has 2 divisors, whose sum is σ = 21892038. Its totient is φ = 21892036.

The previous prime is 21892033. The next prime is 21892097. The reversal of 21892037 is 73029812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19351201 + 2540836 = 4399^2 + 1594^2 .

It is a cyclic number.

It is not a de Polignac number, because 21892037 - 2² = 21892033 is a prime.

It is a super-2 number, since 2×21892037² = 958522568018738, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21891994 and 21892012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21892033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10946018 + 10946019.

It is an arithmetic number, because the mean of its divisors is an integer number (10946019).

Almost surely, 2^21892037 is an apocalyptic number.

It is an amenable number.

21892037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21892037 is an equidigital number, since it uses as much as digits as its factorization.

21892037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 21892037 is about 4678.8927108879. The cubic root of 21892037 is about 279.7448227877.

The spelling of 21892037 in words is "twenty-one million, eight hundred ninety-two thousand, thirty-seven".