221031229 has 8 divisors (see below), whose sum is σ = 240358968. Its totient is φ = 202406400.

The previous prime is 221031211. The next prime is 221031247. The reversal of 221031229 is 922130122.

It is an interprime number because it is at equal distance from previous prime (221031211) and next prime (221031247).

It can be written as a sum of positive squares in 4 ways, for example, as 68508729 + 152522500 = 8277^2 + 12350^2 .

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 221031229 - 2⁷ = 221031101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221031529) 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, 175072 + ... + 176329.

It is an arithmetic number, because the mean of its divisors is an integer number (30044871).

Almost surely, 2^221031229 is an apocalyptic number.

It is an amenable number.

221031229 is a deficient number, since it is larger than the sum of its proper divisors (19327739).

221031229 is a wasteful number, since it uses less digits than its factorization.

221031229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351455.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 221031229 is about 14867.1190551499. The cubic root of 221031229 is about 604.6228362046.

It can be divided in two parts, 22103 and 1229, that added together give a palindrome (23332).

The spelling of 221031229 in words is "two hundred twenty-one million, thirty-one thousand, two hundred twenty-nine".