3933199997621 has 4 divisors (see below), whose sum is σ = 3935106543552. Its totient is φ = 3931293451692.

The previous prime is 3933199997609. The next prime is 3933199997647. The reversal of 3933199997621 is 1267999913393.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3933199997621 - 2¹⁸ = 3933199735477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3933199697621) 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, 953269871 + ... + 953273996.

It is an arithmetic number, because the mean of its divisors is an integer number (983776635888).

Almost surely, 2^{3933199997621} is an apocalyptic number.

It is an amenable number.

3933199997621 is a deficient number, since it is larger than the sum of its proper divisors (1906545931).

3933199997621 is a wasteful number, since it uses less digits than its factorization.

3933199997621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1906545930.

The product of its digits is 133923132, while the sum is 71.

The spelling of 3933199997621 in words is "three trillion, nine hundred thirty-three billion, one hundred ninety-nine million, nine hundred ninety-seven thousand, six hundred twenty-one".