21140401253 has 2 divisors, whose sum is σ = 21140401254. Its totient is φ = 21140401252.

The previous prime is 21140401231. The next prime is 21140401283. The reversal of 21140401253 is 35210404112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13040041249 + 8100360004 = 114193^2 + 90002^2 .

It is a cyclic number.

It is not a de Polignac number, because 21140401253 - 2²⁰ = 21139352677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21140401283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570200626 + 10570200627.

It is an arithmetic number, because the mean of its divisors is an integer number (10570200627).

Almost surely, 2^21140401253 is an apocalyptic number.

It is an amenable number.

21140401253 is a deficient number, since it is larger than the sum of its proper divisors (1).

21140401253 is an equidigital number, since it uses as much as digits as its factorization.

21140401253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 21140401253 its reverse (35210404112), we get a palindrome (56350805365).

The spelling of 21140401253 in words is "twenty-one billion, one hundred forty million, four hundred one thousand, two hundred fifty-three".