221243031 has 6 divisors (see below), whose sum is σ = 319573280. Its totient is φ = 147495348.

The previous prime is 221243023. The next prime is 221243051. The reversal of 221243031 is 130342122.

It is not a de Polignac number, because 221243031 - 2³ = 221243023 is a prime.

It is a super-2 number, since 2×221243031² = 97896957532133922, 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 = 221242995 and 221243013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221243021) 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, 12291271 + ... + 12291288.

Almost surely, 2^221243031 is an apocalyptic number.

221243031 is a deficient number, since it is larger than the sum of its proper divisors (98330249).

221243031 is a wasteful number, since it uses less digits than its factorization.

221243031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24582565 (or 24582562 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 221243031 is about 14874.2405184265. The cubic root of 221243031 is about 604.8159000896.

Adding to 221243031 its reverse (130342122), we get a palindrome (351585153).

Subtracting from 221243031 its reverse (130342122), we obtain a palindrome (90900909).

The spelling of 221243031 in words is "two hundred twenty-one million, two hundred forty-three thousand, thirty-one".