21300879629 has 2 divisors, whose sum is σ = 21300879630. Its totient is φ = 21300879628.

The previous prime is 21300879571. The next prime is 21300879637. The reversal of 21300879629 is 92697800312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18987462025 + 2313417604 = 137795^2 + 48098^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21300879629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21300879679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650439814 + 10650439815.

It is an arithmetic number, because the mean of its divisors is an integer number (10650439815).

Almost surely, 2^21300879629 is an apocalyptic number.

It is an amenable number.

21300879629 is a deficient number, since it is larger than the sum of its proper divisors (1).

21300879629 is an equidigital number, since it uses as much as digits as its factorization.

21300879629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 47.

The spelling of 21300879629 in words is "twenty-one billion, three hundred million, eight hundred seventy-nine thousand, six hundred twenty-nine".