33428444821681 has 24 divisors (see below), whose sum is σ = 41646403022400. Its totient is φ = 26271370022976.

The previous prime is 33428444821649. The next prime is 33428444821727. The reversal of 33428444821681 is 18612844482433.

It is a happy number.

It is not a de Polignac number, because 33428444821681 - 2⁵ = 33428444821649 is a prime.

It is a super-2 number, since 2×33428444821681² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33428444821081) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94647055 + ... + 94999588.

It is an arithmetic number, because the mean of its divisors is an integer number (1735266792600).

Almost surely, 2^{33428444821681} is an apocalyptic number.

It is an amenable number.

33428444821681 is a deficient number, since it is larger than the sum of its proper divisors (8217958200719).

33428444821681 is a wasteful number, since it uses less digits than its factorization.

33428444821681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189646825 (or 189646812 counting only the distinct ones).

The product of its digits is 28311552, while the sum is 58.

The spelling of 33428444821681 in words is "thirty-three trillion, four hundred twenty-eight billion, four hundred forty-four million, eight hundred twenty-one thousand, six hundred eighty-one".