423401403221 has 4 divisors (see below), whose sum is σ = 425011294752. Its totient is φ = 421791511692.

The previous prime is 423401403197. The next prime is 423401403247. The reversal of 423401403221 is 122304104324.

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 423401403221 - 2¹⁰ = 423401402197 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 (423401403421) 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, 804945371 + ... + 804945896.

It is an arithmetic number, because the mean of its divisors is an integer number (106252823688).

Almost surely, 2^423401403221 is an apocalyptic number.

It is an amenable number.

423401403221 is a deficient number, since it is larger than the sum of its proper divisors (1609891531).

423401403221 is a wasteful number, since it uses less digits than its factorization.

423401403221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1609891530.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 423401403221 its reverse (122304104324), we get a palindrome (545705507545).

The spelling of 423401403221 in words is "four hundred twenty-three billion, four hundred one million, four hundred three thousand, two hundred twenty-one".