221012331 has 4 divisors (see below), whose sum is σ = 294683112. Its totient is φ = 147341552.

The previous prime is 221012329. The next prime is 221012347. The reversal of 221012331 is 133210122.

221012331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221012331 - 2¹ = 221012329 is a prime.

It is a super-2 number, since 2×221012331² = 97692900908107122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221012331.

It is not an unprimeable number, because it can be changed into a prime (221012321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36835386 + ... + 36835391.

It is an arithmetic number, because the mean of its divisors is an integer number (73670778).

Almost surely, 2^221012331 is an apocalyptic number.

221012331 is a deficient number, since it is larger than the sum of its proper divisors (73670781).

221012331 is an equidigital number, since it uses as much as digits as its factorization.

221012331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73670780.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 221012331 is about 14866.4834779446. The cubic root of 221012331 is about 604.6056041177.

Adding to 221012331 its reverse (133210122), we get a palindrome (354222453).

It can be divided in two parts, 2210 and 12331, that added together give a palindrome (14541).

The spelling of 221012331 in words is "two hundred twenty-one million, twelve thousand, three hundred thirty-one".