221314432421 has 4 divisors (see below), whose sum is σ = 230936799072. Its totient is φ = 211692065772.

The previous prime is 221314432403. The next prime is 221314432429. The reversal of 221314432421 is 124234413122.

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 a de Polignac number, because none of the positive numbers 2^k-221314432421 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 (221314432429) 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, 4811183291 + ... + 4811183336.

It is an arithmetic number, because the mean of its divisors is an integer number (57734199768).

Almost surely, 2^221314432421 is an apocalyptic number.

It is an amenable number.

221314432421 is a deficient number, since it is larger than the sum of its proper divisors (9622366651).

221314432421 is an equidigital number, since it uses as much as digits as its factorization.

221314432421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9622366650.

The product of its digits is 9216, while the sum is 29.

Adding to 221314432421 its reverse (124234413122), we get a palindrome (345548845543).

The spelling of 221314432421 in words is "two hundred twenty-one billion, three hundred fourteen million, four hundred thirty-two thousand, four hundred twenty-one".