221012100231 has 32 divisors (see below), whose sum is σ = 324963878400. Its totient is φ = 132770461824.

The previous prime is 221012100203. The next prime is 221012100247. The reversal of 221012100231 is 132001210122.

It is not a de Polignac number, because 221012100231 - 2⁶ = 221012100167 is a prime.

It is a super-2 number, since 2×221012100231² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221012100231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012100031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 142680 + ... + 679986.

It is an arithmetic number, because the mean of its divisors is an integer number (10155121200).

Almost surely, 2^221012100231 is an apocalyptic number.

221012100231 is a deficient number, since it is larger than the sum of its proper divisors (103951778169).

221012100231 is a wasteful number, since it uses less digits than its factorization.

221012100231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537575.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 221012100231 its reverse (132001210122), we get a palindrome (353013310353).

The spelling of 221012100231 in words is "two hundred twenty-one billion, twelve million, one hundred thousand, two hundred thirty-one".