21114402412421 has 8 divisors (see below), whose sum is σ = 21171244711320. Its totient is φ = 21057561372672.

The previous prime is 21114402412391. The next prime is 21114402412447. The reversal of 21114402412421 is 12421420441112.

It can be written as a sum of positive squares in 4 ways, for example, as 4262515351396 + 16851887061025 = 2064586^2 + 4105105^2 .

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 21114402412421 - 2²⁶ = 21114335303557 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 (21114402412021) 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, 40310621 + ... + 40831053.

It is an arithmetic number, because the mean of its divisors is an integer number (2646405588915).

Almost surely, 2^{21114402412421} is an apocalyptic number.

It is an amenable number.

21114402412421 is a deficient number, since it is larger than the sum of its proper divisors (56842298899).

21114402412421 is a wasteful number, since it uses less digits than its factorization.

21114402412421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629575.

The product of its (nonzero) digits is 4096, while the sum is 29.

Adding to 21114402412421 its reverse (12421420441112), we get a palindrome (33535822853533).

The spelling of 21114402412421 in words is "twenty-one trillion, one hundred fourteen billion, four hundred two million, four hundred twelve thousand, four hundred twenty-one".