21922837 has 2 divisors, whose sum is σ = 21922838. Its totient is φ = 21922836.

The previous prime is 21922799. The next prime is 21922847. The reversal of 21922837 is 73822912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12916836 + 9006001 = 3594^2 + 3001^2 .

It is a cyclic number.

It is not a de Polignac number, because 21922837 - 2⁷ = 21922709 is a prime.

It is a super-2 number, since 2×21922837² = 961221564257138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21922847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10961418 + 10961419.

It is an arithmetic number, because the mean of its divisors is an integer number (10961419).

Almost surely, 2^21922837 is an apocalyptic number.

It is an amenable number.

21922837 is a deficient number, since it is larger than the sum of its proper divisors (1).

21922837 is an equidigital number, since it uses as much as digits as its factorization.

21922837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 34.

The square root of 21922837 is about 4682.1829310697. The cubic root of 21922837 is about 279.8759527050.

The spelling of 21922837 in words is "twenty-one million, nine hundred twenty-two thousand, eight hundred thirty-seven".