221133031 has 24 divisors (see below), whose sum is σ = 263180400. Its totient is φ = 185213952.

The previous prime is 221132993. The next prime is 221133061. The reversal of 221133031 is 130331122.

It is not a de Polignac number, because 221133031 - 2⁷ = 221132903 is a prime.

It is a super-2 number, since 2×221133031² = 97799634798493922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221132996 and 221133014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221133061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 633445 + ... + 633793.

It is an arithmetic number, because the mean of its divisors is an integer number (10965850).

Almost surely, 2^221133031 is an apocalyptic number.

221133031 is a deficient number, since it is larger than the sum of its proper divisors (42047369).

221133031 is a wasteful number, since it uses less digits than its factorization.

221133031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623 (or 616 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 221133031 is about 14870.5423909150. The cubic root of 221133031 is about 604.7156471720.

Adding to 221133031 its reverse (130331122), we get a palindrome (351464153).

The spelling of 221133031 in words is "two hundred twenty-one million, one hundred thirty-three thousand, thirty-one".