2033537971921 has 4 divisors (see below), whose sum is σ = 2052194283700. Its totient is φ = 2014881660144.

The previous prime is 2033537971859. The next prime is 2033537971981. The reversal of 2033537971921 is 1291797353302.

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 1503897532225 + 529640439696 = 1226335^2 + 727764^2 .

It is a cyclic number.

It is not a de Polignac number, because 2033537971921 - 2⁷ = 2033537971793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2033537971981) 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, 9328155726 + ... + 9328155943.

It is an arithmetic number, because the mean of its divisors is an integer number (513048570925).

Almost surely, 2^{2033537971921} is an apocalyptic number.

It is an amenable number.

2033537971921 is a deficient number, since it is larger than the sum of its proper divisors (18656311779).

2033537971921 is a wasteful number, since it uses less digits than its factorization.

2033537971921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18656311778.

The product of its (nonzero) digits is 2143260, while the sum is 52.

The spelling of 2033537971921 in words is "two trillion, thirty-three billion, five hundred thirty-seven million, nine hundred seventy-one thousand, nine hundred twenty-one".