21604060237 has 2 divisors, whose sum is σ = 21604060238. Its totient is φ = 21604060236.

The previous prime is 21604060217. The next prime is 21604060249. The reversal of 21604060237 is 73206040612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14318754921 + 7285305316 = 119661^2 + 85354^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21604060237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21604060199 and 21604060208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21604060217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10802030118 + 10802030119.

It is an arithmetic number, because the mean of its divisors is an integer number (10802030119).

Almost surely, 2^21604060237 is an apocalyptic number.

It is an amenable number.

21604060237 is a deficient number, since it is larger than the sum of its proper divisors (1).

21604060237 is an equidigital number, since it uses as much as digits as its factorization.

21604060237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 31.

The spelling of 21604060237 in words is "twenty-one billion, six hundred four million, sixty thousand, two hundred thirty-seven".