221431232344 has 32 divisors (see below), whose sum is σ = 490857415200. Its totient is φ = 91626716160.

The previous prime is 221431232333. The next prime is 221431232417. The reversal of 221431232344 is 443232134122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68173017 + ... + 68176264.

It is an arithmetic number, because the mean of its divisors is an integer number (15339294225).

Almost surely, 2^221431232344 is an apocalyptic number.

It is an amenable number.

221431232344 is an abundant number, since it is smaller than the sum of its proper divisors (269426182856).

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

221431232344 is a wasteful number, since it uses less digits than its factorization.

221431232344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136349323 (or 136349319 counting only the distinct ones).

The product of its digits is 27648, while the sum is 31.

Adding to 221431232344 its reverse (443232134122), we get a palindrome (664663366466).

The spelling of 221431232344 in words is "two hundred twenty-one billion, four hundred thirty-one million, two hundred thirty-two thousand, three hundred forty-four".