133000331221 has 4 divisors (see below), whose sum is σ = 133037725932. Its totient is φ = 132962936512.

The previous prime is 133000331213. The next prime is 133000331287. The reversal of 133000331221 is 122133000331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122133000331 = 19 ⋅6428052649.

It can be written as a sum of positive squares in 2 ways, for example, as 15998708196 + 117001623025 = 126486^2 + 342055^2 .

It is a cyclic number.

It is not a de Polignac number, because 133000331221 - 2³ = 133000331213 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 (133000331201) 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, 18692020 + ... + 18699133.

It is an arithmetic number, because the mean of its divisors is an integer number (33259431483).

Almost surely, 2^133000331221 is an apocalyptic number.

It is an amenable number.

133000331221 is a deficient number, since it is larger than the sum of its proper divisors (37394711).

133000331221 is an equidigital number, since it uses as much as digits as its factorization.

133000331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37394710.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 133000331221 its reverse (122133000331), we get a palindrome (255133331552).

The spelling of 133000331221 in words is "one hundred thirty-three billion, three hundred thirty-one thousand, two hundred twenty-one".