21100122222493 has 2 divisors, whose sum is σ = 21100122222494. Its totient is φ = 21100122222492.

The previous prime is 21100122222479. The next prime is 21100122222521. The reversal of 21100122222493 is 39422222100112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11411606903449 + 9688515319044 = 3378107^2 + 3112638^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100122222493 - 2⁵ = 21100122222461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100122222593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550061111246 + 10550061111247.

It is an arithmetic number, because the mean of its divisors is an integer number (10550061111247).

Almost surely, 2^{21100122222493} is an apocalyptic number.

It is an amenable number.

21100122222493 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100122222493 is an equidigital number, since it uses as much as digits as its factorization.

21100122222493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The spelling of 21100122222493 in words is "twenty-one trillion, one hundred billion, one hundred twenty-two million, two hundred twenty-two thousand, four hundred ninety-three".