421322400221 has 16 divisors (see below), whose sum is σ = 442637215488. Its totient is φ = 400258320000.

The previous prime is 421322400193. The next prime is 421322400253. The reversal of 421322400221 is 122004223124.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421322400221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421322300221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27349121 + ... + 27364521.

It is an arithmetic number, because the mean of its divisors is an integer number (27664825968).

Almost surely, 2^421322400221 is an apocalyptic number.

It is an amenable number.

421322400221 is a deficient number, since it is larger than the sum of its proper divisors (21314815267).

421322400221 is a wasteful number, since it uses less digits than its factorization.

421322400221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23452.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 421322400221 its reverse (122004223124), we get a palindrome (543326623345).

The spelling of 421322400221 in words is "four hundred twenty-one billion, three hundred twenty-two million, four hundred thousand, two hundred twenty-one".