221101013231 has 4 divisors (see below), whose sum is σ = 252686872272. Its totient is φ = 189515154192.

The previous prime is 221101013209. The next prime is 221101013239. The reversal of 221101013231 is 132310101122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132310101122 = 2 ⋅66155050561.

It is not a de Polignac number, because 221101013231 - 2¹⁸ = 221100751087 is a prime.

It is a super-2 number, since 2×221101013231² (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 (221101013239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15792929510 + ... + 15792929523.

It is an arithmetic number, because the mean of its divisors is an integer number (63171718068).

Almost surely, 2^221101013231 is an apocalyptic number.

221101013231 is a deficient number, since it is larger than the sum of its proper divisors (31585859041).

221101013231 is an equidigital number, since it uses as much as digits as its factorization.

221101013231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31585859040.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 221101013231 its reverse (132310101122), we get a palindrome (353411114353).

The spelling of 221101013231 in words is "two hundred twenty-one billion, one hundred one million, thirteen thousand, two hundred thirty-one".