21100122222523 has 2 divisors, whose sum is σ = 21100122222524. Its totient is φ = 21100122222522.

The previous prime is 21100122222521. The next prime is 21100122222541. The reversal of 21100122222523 is 32522222100112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21100122222523 - 2¹ = 21100122222521 is a prime.

Together with 21100122222521, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21100122222521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550061111261 + 10550061111262.

It is an arithmetic number, because the mean of its divisors is an integer number (10550061111262).

Almost surely, 2^{21100122222523} is an apocalyptic number.

21100122222523 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100122222523 is an equidigital number, since it uses as much as digits as its factorization.

21100122222523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21100122222523 its reverse (32522222100112), we get a palindrome (53622344322635).

The spelling of 21100122222523 in words is "twenty-one trillion, one hundred billion, one hundred twenty-two million, two hundred twenty-two thousand, five hundred twenty-three".