221331230031 has 8 divisors (see below), whose sum is σ = 295178072704. Its totient is φ = 147519270360.

The previous prime is 221331230027. The next prime is 221331230051. The reversal of 221331230031 is 130032133122.

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

It is not a de Polignac number, because 221331230031 - 2² = 221331230027 is a prime.

It is a super-2 number, since 2×221331230031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221331230051) 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, 8705941 + ... + 8731326.

It is an arithmetic number, because the mean of its divisors is an integer number (36897259088).

Almost surely, 2^221331230031 is an apocalyptic number.

221331230031 is a deficient number, since it is larger than the sum of its proper divisors (73846842673).

221331230031 is a wasteful number, since it uses less digits than its factorization.

221331230031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17441501.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 221331230031 its reverse (130032133122), we get a palindrome (351363363153).

The spelling of 221331230031 in words is "two hundred twenty-one billion, three hundred thirty-one million, two hundred thirty thousand, thirty-one".