21202102049 has 2 divisors, whose sum is σ = 21202102050. Its totient is φ = 21202102048.

The previous prime is 21202102021. The next prime is 21202102057. The reversal of 21202102049 is 94020120212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10760327824 + 10441774225 = 103732^2 + 102185^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202102049 - 2²⁴ = 21185324833 is a prime.

It is not a weakly prime, because it can be changed into another prime (21202102099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601051024 + 10601051025.

It is an arithmetic number, because the mean of its divisors is an integer number (10601051025).

Almost surely, 2^21202102049 is an apocalyptic number.

It is an amenable number.

21202102049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202102049 is an equidigital number, since it uses as much as digits as its factorization.

21202102049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The spelling of 21202102049 in words is "twenty-one billion, two hundred two million, one hundred two thousand, forty-nine".