33138021731 has 4 divisors (see below), whose sum is σ = 33149607264. Its totient is φ = 33126436200.

The previous prime is 33138021701. The next prime is 33138021739. The reversal of 33138021731 is 13712083133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13712083133 = 7 ⋅1958869019.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33138021731 is a prime.

It is a super-2 number, since 2×33138021731² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33138021739) 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, 5788475 + ... + 5794196.

It is an arithmetic number, because the mean of its divisors is an integer number (8287401816).

Almost surely, 2^33138021731 is an apocalyptic number.

33138021731 is a deficient number, since it is larger than the sum of its proper divisors (11585533).

33138021731 is a wasteful number, since it uses less digits than its factorization.

33138021731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11585532.

The product of its (nonzero) digits is 9072, while the sum is 32.

The spelling of 33138021731 in words is "thirty-three billion, one hundred thirty-eight million, twenty-one thousand, seven hundred thirty-one".