21402025253 has 8 divisors (see below), whose sum is σ = 24860432640. Its totient is φ = 18043861680.

The previous prime is 21402025243. The next prime is 21402025289. The reversal of 21402025253 is 35252020412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21402025253 - 2⁸ = 21402024997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21402025213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25060493 + ... + 25061346.

It is an arithmetic number, because the mean of its divisors is an integer number (3107554080).

Almost surely, 2^21402025253 is an apocalyptic number.

It is an amenable number.

21402025253 is a deficient number, since it is larger than the sum of its proper divisors (3458407387).

21402025253 is an equidigital number, since it uses as much as digits as its factorization.

21402025253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50121907.

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 21402025253 its reverse (35252020412), we get a palindrome (56654045665).

The spelling of 21402025253 in words is "twenty-one billion, four hundred two million, twenty-five thousand, two hundred fifty-three".