21523502130101 has 2 divisors, whose sum is σ = 21523502130102. Its totient is φ = 21523502130100.

The previous prime is 21523502129851. The next prime is 21523502130113. The reversal of 21523502130101 is 10103120532512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15631158547876 + 5892343582225 = 3953626^2 + 2427415^2 .

It is a cyclic number.

It is not a de Polignac number, because 21523502130101 - 2¹⁸ = 21523501867957 is a prime.

It is a super-2 number, since 2×21523502130101² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21523502130131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10761751065050 + 10761751065051.

It is an arithmetic number, because the mean of its divisors is an integer number (10761751065051).

Almost surely, 2^{21523502130101} is an apocalyptic number.

It is an amenable number.

21523502130101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21523502130101 is an equidigital number, since it uses as much as digits as its factorization.

21523502130101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 26.

Adding to 21523502130101 its reverse (10103120532512), we get a palindrome (31626622662613).

The spelling of 21523502130101 in words is "twenty-one trillion, five hundred twenty-three billion, five hundred two million, one hundred thirty thousand, one hundred one".