221431023363426 has 32 divisors (see below), whose sum is σ = 446259166138368. Its totient is φ = 73244196202320.

The previous prime is 221431023363397. The next prime is 221431023363443. The reversal of 221431023363426 is 624363320134122.

It is a super-2 number, since 2×221431023363426² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16129231 + ... + 26514413.

It is an arithmetic number, because the mean of its divisors is an integer number (13945598941824).

Almost surely, 2^{221431023363426} is an apocalyptic number.

221431023363426 is an abundant number, since it is smaller than the sum of its proper divisors (224828142774942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221431023363426 is a wasteful number, since it uses less digits than its factorization.

221431023363426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10412446.

The product of its (nonzero) digits is 746496, while the sum is 42.

Adding to 221431023363426 its reverse (624363320134122), we get a palindrome (845794343497548).

The spelling of 221431023363426 in words is "two hundred twenty-one trillion, four hundred thirty-one billion, twenty-three million, three hundred sixty-three thousand, four hundred twenty-six".