21136311629 has 2 divisors, whose sum is σ = 21136311630. Its totient is φ = 21136311628.

The previous prime is 21136311601. The next prime is 21136311697. The reversal of 21136311629 is 92611363112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16907800900 + 4228510729 = 130030^2 + 65027^2 .

It is a cyclic number.

It is not a de Polignac number, because 21136311629 - 2⁸ = 21136311373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21136311529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10568155814 + 10568155815.

It is an arithmetic number, because the mean of its divisors is an integer number (10568155815).

Almost surely, 2^21136311629 is an apocalyptic number.

It is an amenable number.

21136311629 is a deficient number, since it is larger than the sum of its proper divisors (1).

21136311629 is an equidigital number, since it uses as much as digits as its factorization.

21136311629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 35.

The spelling of 21136311629 in words is "twenty-one billion, one hundred thirty-six million, three hundred eleven thousand, six hundred twenty-nine".