21132656213 has 2 divisors, whose sum is σ = 21132656214. Its totient is φ = 21132656212.

The previous prime is 21132656173. The next prime is 21132656261. The reversal of 21132656213 is 31265623112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17255975044 + 3876681169 = 131362^2 + 62263^2 .

It is a cyclic number.

It is not a de Polignac number, because 21132656213 - 2¹² = 21132652117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21132656213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21132656513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566328106 + 10566328107.

It is an arithmetic number, because the mean of its divisors is an integer number (10566328107).

Almost surely, 2^21132656213 is an apocalyptic number.

It is an amenable number.

21132656213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21132656213 is an equidigital number, since it uses as much as digits as its factorization.

21132656213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 32.

The spelling of 21132656213 in words is "twenty-one billion, one hundred thirty-two million, six hundred fifty-six thousand, two hundred thirteen".