221352133 has 8 divisors (see below), whose sum is σ = 226032408. Its totient is φ = 216716544.

The previous prime is 221352113. The next prime is 221352137. The reversal of 221352133 is 331253122.

It can be written as a sum of positive squares in 4 ways, for example, as 44116164 + 177235969 = 6642^2 + 13313^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221352133 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 (221352137) 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, 1066 + ... + 21067.

It is an arithmetic number, because the mean of its divisors is an integer number (28254051).

Almost surely, 2^221352133 is an apocalyptic number.

It is an amenable number.

221352133 is a deficient number, since it is larger than the sum of its proper divisors (4680275).

221352133 is a wasteful number, since it uses less digits than its factorization.

221352133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22343.

The product of its digits is 1080, while the sum is 22.

The square root of 221352133 is about 14877.9075477703. The cubic root of 221352133 is about 604.9153017601.

The spelling of 221352133 in words is "two hundred twenty-one million, three hundred fifty-two thousand, one hundred thirty-three".