21243164444629 has 2 divisors, whose sum is σ = 21243164444630. Its totient is φ = 21243164444628.

The previous prime is 21243164444603. The next prime is 21243164444699. The reversal of 21243164444629 is 92644446134212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13474552392900 + 7768612051729 = 3670770^2 + 2787223^2 .

It is a cyclic number.

It is not a de Polignac number, because 21243164444629 - 2²⁵ = 21243130890197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21243164444699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10621582222314 + 10621582222315.

It is an arithmetic number, because the mean of its divisors is an integer number (10621582222315).

Almost surely, 2^{21243164444629} is an apocalyptic number.

It is an amenable number.

21243164444629 is a deficient number, since it is larger than the sum of its proper divisors (1).

21243164444629 is an equidigital number, since it uses as much as digits as its factorization.

21243164444629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7962624, while the sum is 52.

The spelling of 21243164444629 in words is "twenty-one trillion, two hundred forty-three billion, one hundred sixty-four million, four hundred forty-four thousand, six hundred twenty-nine".