221242031 has 8 divisors (see below), whose sum is σ = 223632000. Its totient is φ = 218865240.

The previous prime is 221242003. The next prime is 221242039. The reversal of 221242031 is 130242122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221242031 - 2¹⁴ = 221225647 is a prime.

It is a super-2 number, since 2×221242031² = 97896072562009922, which 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 (221242039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32516 + ... + 38726.

It is an arithmetic number, because the mean of its divisors is an integer number (27954000).

Almost surely, 2^221242031 is an apocalyptic number.

221242031 is a deficient number, since it is larger than the sum of its proper divisors (2389969).

221242031 is a wasteful number, since it uses less digits than its factorization.

221242031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6589.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 221242031 is about 14874.2069032268. The cubic root of 221242031 is about 604.8149888491.

Adding to 221242031 its reverse (130242122), we get a palindrome (351484153).

Subtracting from 221242031 its reverse (130242122), we obtain a palindrome (90999909).

The spelling of 221242031 in words is "two hundred twenty-one million, two hundred forty-two thousand, thirty-one".