21137574229 has 2 divisors, whose sum is σ = 21137574230. Its totient is φ = 21137574228.

The previous prime is 21137574221. The next prime is 21137574343. The reversal of 21137574229 is 92247573112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18285800625 + 2851773604 = 135225^2 + 53402^2 .

It is a cyclic number.

It is not a de Polignac number, because 21137574229 - 2³ = 21137574221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21137574221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10568787114 + 10568787115.

It is an arithmetic number, because the mean of its divisors is an integer number (10568787115).

Almost surely, 2^21137574229 is an apocalyptic number.

It is an amenable number.

21137574229 is a deficient number, since it is larger than the sum of its proper divisors (1).

21137574229 is an equidigital number, since it uses as much as digits as its factorization.

21137574229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 43.

The spelling of 21137574229 in words is "twenty-one billion, one hundred thirty-seven million, five hundred seventy-four thousand, two hundred twenty-nine".