21101001210901 has 2 divisors, whose sum is σ = 21101001210902. Its totient is φ = 21101001210900.

The previous prime is 21101001210871. The next prime is 21101001210941. The reversal of 21101001210901 is 10901210010112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21032780994801 + 68220216100 = 4586151^2 + 261190^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101001210901 - 2²³ = 21100992822293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101001210941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550500605450 + 10550500605451.

It is an arithmetic number, because the mean of its divisors is an integer number (10550500605451).

Almost surely, 2^{21101001210901} is an apocalyptic number.

It is an amenable number.

21101001210901 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101001210901 is an equidigital number, since it uses as much as digits as its factorization.

21101001210901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 19.

The spelling of 21101001210901 in words is "twenty-one trillion, one hundred one billion, one million, two hundred ten thousand, nine hundred one".