33645235136021 has 4 divisors (see below), whose sum is σ = 33688760667372. Its totient is φ = 33601709604672.

The previous prime is 33645235136017. The next prime is 33645235136041. The reversal of 33645235136021 is 12063153254633.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6124194533521 + 27521040602500 = 2474711^2 + 5246050^2 .

It is a cyclic number.

It is not a de Polignac number, because 33645235136021 - 2² = 33645235136017 is a prime.

It is a super-2 number, since 2×33645235136021² (a number of 28 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 (33645235136041) 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, 21762764516 + ... + 21762766061.

It is an arithmetic number, because the mean of its divisors is an integer number (8422190166843).

Almost surely, 2^{33645235136021} is an apocalyptic number.

It is an amenable number.

33645235136021 is a deficient number, since it is larger than the sum of its proper divisors (43525531351).

33645235136021 is an equidigital number, since it uses as much as digits as its factorization.

33645235136021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43525531350.

The product of its (nonzero) digits is 1166400, while the sum is 44.

The spelling of 33645235136021 in words is "thirty-three trillion, six hundred forty-five billion, two hundred thirty-five million, one hundred thirty-six thousand, twenty-one".