221004210423431 has 4 divisors (see below), whose sum is σ = 221126244776664. Its totient is φ = 220882176070200.

The previous prime is 221004210423421. The next prime is 221004210423509. The reversal of 221004210423431 is 134324012400122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221004210423431 - 2²⁶ = 221004143314567 is a prime.

It is a super-2 number, since 2×221004210423431² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221004210423394 and 221004210423403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221004210423401) 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, 61017173900 + ... + 61017177521.

It is an arithmetic number, because the mean of its divisors is an integer number (55281561194166).

Almost surely, 2^{221004210423431} is an apocalyptic number.

221004210423431 is a deficient number, since it is larger than the sum of its proper divisors (122034353233).

221004210423431 is a wasteful number, since it uses less digits than its factorization.

221004210423431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122034353232.

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

Adding to 221004210423431 its reverse (134324012400122), we get a palindrome (355328222823553).

The spelling of 221004210423431 in words is "two hundred twenty-one trillion, four billion, two hundred ten million, four hundred twenty-three thousand, four hundred thirty-one".