133446915221 has 8 divisors (see below), whose sum is σ = 133570968888. Its totient is φ = 133322904000.

The previous prime is 133446915191. The next prime is 133446915227. The reversal of 133446915221 is 122519644331.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 14045568196 + 119401347025 = 118514^2 + 345545^2 .

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 133446915221 - 2⁶ = 133446915157 is a prime.

It is a super-2 number, since 2×133446915221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133446915227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11844731 + ... + 11855991.

It is an arithmetic number, because the mean of its divisors is an integer number (16696371111).

Almost surely, 2^133446915221 is an apocalyptic number.

It is an amenable number.

133446915221 is a deficient number, since it is larger than the sum of its proper divisors (124053667).

133446915221 is a wasteful number, since it uses less digits than its factorization.

133446915221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21223.

The product of its digits is 155520, while the sum is 41.

The spelling of 133446915221 in words is "one hundred thirty-three billion, four hundred forty-six million, nine hundred fifteen thousand, two hundred twenty-one".