21245568037 has 2 divisors, whose sum is σ = 21245568038. Its totient is φ = 21245568036.

The previous prime is 21245567989. The next prime is 21245568089. The reversal of 21245568037 is 73086554212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14450203681 + 6795364356 = 120209^2 + 82434^2 .

It is a cyclic number.

It is not a de Polignac number, because 21245568037 - 2⁷ = 21245567909 is a prime.

It is a super-2 number, since 2×21245568037² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21245567984 and 21245568002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21245568937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10622784018 + 10622784019.

It is an arithmetic number, because the mean of its divisors is an integer number (10622784019).

Almost surely, 2^21245568037 is an apocalyptic number.

It is an amenable number.

21245568037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21245568037 is an equidigital number, since it uses as much as digits as its factorization.

21245568037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 403200, while the sum is 43.

The spelling of 21245568037 in words is "twenty-one billion, two hundred forty-five million, five hundred sixty-eight thousand, thirty-seven".