21132009929 has 2 divisors, whose sum is σ = 21132009930. Its totient is φ = 21132009928.

The previous prime is 21132009923. The next prime is 21132010019. The reversal of 21132009929 is 92990023112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16627586704 + 4504423225 = 128948^2 + 67115^2 .

It is a cyclic number.

It is not a de Polignac number, because 21132009929 - 2⁸ = 21132009673 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21132009892 and 21132009901.

It is not a weakly prime, because it can be changed into another prime (21132009923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566004964 + 10566004965.

It is an arithmetic number, because the mean of its divisors is an integer number (10566004965).

Almost surely, 2^21132009929 is an apocalyptic number.

It is an amenable number.

21132009929 is a deficient number, since it is larger than the sum of its proper divisors (1).

21132009929 is an equidigital number, since it uses as much as digits as its factorization.

21132009929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 38.

The spelling of 21132009929 in words is "twenty-one billion, one hundred thirty-two million, nine thousand, nine hundred twenty-nine".