21523404144101 has 2 divisors, whose sum is σ = 21523404144102. Its totient is φ = 21523404144100.

The previous prime is 21523404144059. The next prime is 21523404144197. The reversal of 21523404144101 is 10144140432512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14533059450625 + 6990344693476 = 3812225^2 + 2643926^2 .

It is a cyclic number.

It is not a de Polignac number, because 21523404144101 - 2³⁸ = 21248526237157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21523404144701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10761702072050 + 10761702072051.

It is an arithmetic number, because the mean of its divisors is an integer number (10761702072051).

Almost surely, 2^{21523404144101} is an apocalyptic number.

It is an amenable number.

21523404144101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21523404144101 is an equidigital number, since it uses as much as digits as its factorization.

21523404144101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15360, while the sum is 32.

Adding to 21523404144101 its reverse (10144140432512), we get a palindrome (31667544576613).

The spelling of 21523404144101 in words is "twenty-one trillion, five hundred twenty-three billion, four hundred four million, one hundred forty-four thousand, one hundred one".