21101310253 has 2 divisors, whose sum is σ = 21101310254. Its totient is φ = 21101310252.

The previous prime is 21101310169. The next prime is 21101310277. The reversal of 21101310253 is 35201310112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20244167524 + 857142729 = 142282^2 + 29277^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21101310253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21101310253.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101310283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550655126 + 10550655127.

It is an arithmetic number, because the mean of its divisors is an integer number (10550655127).

Almost surely, 2^21101310253 is an apocalyptic number.

It is an amenable number.

21101310253 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101310253 is an equidigital number, since it uses as much as digits as its factorization.

21101310253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 19.

Adding to 21101310253 its reverse (35201310112), we get a palindrome (56302620365).

The spelling of 21101310253 in words is "twenty-one billion, one hundred one million, three hundred ten thousand, two hundred fifty-three".