221031013 has 12 divisors (see below), whose sum is σ = 258666912. Its totient is φ = 188313720.

The previous prime is 221031001. The next prime is 221031017. The reversal of 221031013 is 310130122.

221031013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221031013 - 2⁹ = 221030501 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221030984 and 221031002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221031017) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5323 + ... + 21688.

It is an arithmetic number, because the mean of its divisors is an integer number (21555576).

Almost surely, 2^221031013 is an apocalyptic number.

It is an amenable number.

221031013 is a deficient number, since it is larger than the sum of its proper divisors (37635899).

221031013 is a wasteful number, since it uses less digits than its factorization.

221031013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27192 (or 27185 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 221031013 is about 14867.1117907951. Note that the first 3 decimals coincide. The cubic root of 221031013 is about 604.6226392511.

Adding to 221031013 its reverse (310130122), we get a palindrome (531161135).

The spelling of 221031013 in words is "two hundred twenty-one million, thirty-one thousand, thirteen".