221513031 has 6 divisors (see below), whose sum is σ = 319963280. Its totient is φ = 147675348.

The previous prime is 221512999. The next prime is 221513053. The reversal of 221513031 is 130315122.

It is not a de Polignac number, because 221513031 - 2⁵ = 221512999 is a prime.

It is a super-2 number, since 2×221513031² = 98136045805613922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221512995 and 221513013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221513531) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12306271 + ... + 12306288.

Almost surely, 2^221513031 is an apocalyptic number.

221513031 is a deficient number, since it is larger than the sum of its proper divisors (98450249).

221513031 is a wasteful number, since it uses less digits than its factorization.

221513031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24612565 (or 24612562 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 221513031 is about 14883.3138447054. The cubic root of 221513031 is about 605.0618346288.

Adding to 221513031 its reverse (130315122), we get a palindrome (351828153).

The spelling of 221513031 in words is "two hundred twenty-one million, five hundred thirteen thousand, thirty-one".