21013204622253 has 4 divisors (see below), whose sum is σ = 28017606163008. Its totient is φ = 14008803081500.

The previous prime is 21013204622243. The next prime is 21013204622317. The reversal of 21013204622253 is 35222640231012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21013204622253 - 2¹² = 21013204618157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013204622243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3502200770373 + ... + 3502200770378.

It is an arithmetic number, because the mean of its divisors is an integer number (7004401540752).

Almost surely, 2^{21013204622253} is an apocalyptic number.

It is an amenable number.

21013204622253 is a deficient number, since it is larger than the sum of its proper divisors (7004401540755).

21013204622253 is an equidigital number, since it uses as much as digits as its factorization.

21013204622253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7004401540754.

The product of its (nonzero) digits is 34560, while the sum is 33.

Adding to 21013204622253 its reverse (35222640231012), we get a palindrome (56235844853265).

The spelling of 21013204622253 in words is "twenty-one trillion, thirteen billion, two hundred four million, six hundred twenty-two thousand, two hundred fifty-three".