21260202149 has 2 divisors, whose sum is σ = 21260202150. Its totient is φ = 21260202148.

The previous prime is 21260202137. The next prime is 21260202179. The reversal of 21260202149 is 94120206212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20218849249 + 1041352900 = 142193^2 + 32270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21260202149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21260202179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10630101074 + 10630101075.

It is an arithmetic number, because the mean of its divisors is an integer number (10630101075).

Almost surely, 2^21260202149 is an apocalyptic number.

It is an amenable number.

21260202149 is a deficient number, since it is larger than the sum of its proper divisors (1).

21260202149 is an equidigital number, since it uses as much as digits as its factorization.

21260202149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The spelling of 21260202149 in words is "twenty-one billion, two hundred sixty million, two hundred two thousand, one hundred forty-nine".