21101100413 has 2 divisors, whose sum is σ = 21101100414. Its totient is φ = 21101100412.

The previous prime is 21101100287. The next prime is 21101100421. The reversal of 21101100413 is 31400110112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18221490169 + 2879610244 = 134987^2 + 53662^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101100413 - 2²⁰ = 21100051837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101100443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550550206 + 10550550207.

It is an arithmetic number, because the mean of its divisors is an integer number (10550550207).

Almost surely, 2^21101100413 is an apocalyptic number.

It is an amenable number.

21101100413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101100413 is an equidigital number, since it uses as much as digits as its factorization.

21101100413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21101100413 its reverse (31400110112), we get a palindrome (52501210525).

The spelling of 21101100413 in words is "twenty-one billion, one hundred one million, one hundred thousand, four hundred thirteen".