221431244334421 has 16 divisors (see below), whose sum is σ = 241668315237888. Its totient is φ = 201212014172400.

The previous prime is 221431244334409. The next prime is 221431244334463. The reversal of 221431244334421 is 124433442134122.

It is not a de Polignac number, because 221431244334421 - 2²¹ = 221431242237269 is a prime.

It is a super-2 number, since 2×221431244334421² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221431244334401) 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, 311650656 + ... + 312360358.

It is an arithmetic number, because the mean of its divisors is an integer number (15104269702368).

Almost surely, 2^{221431244334421} is an apocalyptic number.

It is an amenable number.

221431244334421 is a deficient number, since it is larger than the sum of its proper divisors (20237070903467).

221431244334421 is a wasteful number, since it uses less digits than its factorization.

221431244334421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722232.

The product of its digits is 442368, while the sum is 40.

Adding to 221431244334421 its reverse (124433442134122), we get a palindrome (345864686468543).

The spelling of 221431244334421 in words is "two hundred twenty-one trillion, four hundred thirty-one billion, two hundred forty-four million, three hundred thirty-four thousand, four hundred twenty-one".