133220231 has 4 divisors (see below), whose sum is σ = 136054752. Its totient is φ = 130385712.

The previous prime is 133220189. The next prime is 133220249. The reversal of 133220231 is 132022331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132022331 = 7 ⋅18860333.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133220231 is a prime.

It is a super-2 number, since 2×133220231² = 35495259895386722, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133220251) 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, 1417190 + ... + 1417283.

It is an arithmetic number, because the mean of its divisors is an integer number (34013688).

Almost surely, 2^133220231 is an apocalyptic number.

133220231 is a deficient number, since it is larger than the sum of its proper divisors (2834521).

133220231 is an equidigital number, since it uses as much as digits as its factorization.

133220231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2834520.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 133220231 is about 11542.1068700649. The cubic root of 133220231 is about 510.7284617569.

Adding to 133220231 its reverse (132022331), we get a palindrome (265242562).

The spelling of 133220231 in words is "one hundred thirty-three million, two hundred twenty thousand, two hundred thirty-one".