3924867901021 has 12 divisors (see below), whose sum is σ = 4313093120820. Its totient is φ = 3566614231040.

The previous prime is 3924867901013. The next prime is 3924867901027. The reversal of 3924867901021 is 1201097684293.

It can be written as a sum of positive squares in 6 ways, for example, as 1385832801796 + 2539035099225 = 1177214^2 + 1593435^2 .

It is not a de Polignac number, because 3924867901021 - 2³ = 3924867901013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3924867901021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3924867901027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 234144340 + ... + 234161101.

It is an arithmetic number, because the mean of its divisors is an integer number (359424426735).

Almost surely, 2^{3924867901021} is an apocalyptic number.

It is an amenable number.

3924867901021 is a deficient number, since it is larger than the sum of its proper divisors (388225219799).

3924867901021 is a wasteful number, since it uses less digits than its factorization.

3924867901021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468305504 (or 468305487 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 3924867901021 in words is "three trillion, nine hundred twenty-four billion, eight hundred sixty-seven million, nine hundred one thousand, twenty-one".