21514237253 has 2 divisors, whose sum is σ = 21514237254. Its totient is φ = 21514237252.

The previous prime is 21514237249. The next prime is 21514237259. The reversal of 21514237253 is 35273241512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12343876609 + 9170360644 = 111103^2 + 95762^2 .

It is a cyclic number.

It is not a de Polignac number, because 21514237253 - 2² = 21514237249 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21514237259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10757118626 + 10757118627.

It is an arithmetic number, because the mean of its divisors is an integer number (10757118627).

Almost surely, 2^21514237253 is an apocalyptic number.

It is an amenable number.

21514237253 is a deficient number, since it is larger than the sum of its proper divisors (1).

21514237253 is an equidigital number, since it uses as much as digits as its factorization.

21514237253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 35.

Adding to 21514237253 its reverse (35273241512), we get a palindrome (56787478765).

The spelling of 21514237253 in words is "twenty-one billion, five hundred fourteen million, two hundred thirty-seven thousand, two hundred fifty-three".