221220223431 has 8 divisors (see below), whose sum is σ = 294962586624. Its totient is φ = 147479004600.

The previous prime is 221220223403. The next prime is 221220223453. The reversal of 221220223431 is 134322022122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221220223431 - 2¹⁰ = 221220222407 is a prime.

It is a super-2 number, since 2×221220223431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221220223481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400090 + ... + 776216.

It is an arithmetic number, because the mean of its divisors is an integer number (36870323328).

Almost surely, 2^221220223431 is an apocalyptic number.

221220223431 is a deficient number, since it is larger than the sum of its proper divisors (73742363193).

221220223431 is a wasteful number, since it uses less digits than its factorization.

221220223431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572181.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 221220223431 its reverse (134322022122), we get a palindrome (355542245553).

The spelling of 221220223431 in words is "two hundred twenty-one billion, two hundred twenty million, two hundred twenty-three thousand, four hundred thirty-one".