3924120921 has 32 divisors (see below), whose sum is σ = 6027276288. Its totient is φ = 2224558080.

The previous prime is 3924120869. The next prime is 3924120979. The reversal of 3924120921 is 1290214293.

It is not a de Polignac number, because 3924120921 - 2¹⁰ = 3924119897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3924120121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1461246 + ... + 1463928.

It is an arithmetic number, because the mean of its divisors is an integer number (188352384).

Almost surely, 2^3924120921 is an apocalyptic number.

It is an amenable number.

3924120921 is a deficient number, since it is larger than the sum of its proper divisors (2103155367).

3924120921 is a wasteful number, since it uses less digits than its factorization.

3924120921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3221.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 3924120921 is about 62642.8042236297. The cubic root of 3924120921 is about 1577.2993603754.

The spelling of 3924120921 in words is "three billion, nine hundred twenty-four million, one hundred twenty thousand, nine hundred twenty-one".