3999023421121 has 16 divisors (see below), whose sum is σ = 4316982168960. Its totient is φ = 3693083954560.

The previous prime is 3999023421101. The next prime is 3999023421203. The reversal of 3999023421121 is 1211243209993.

3999023421121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 3999023421121 - 2¹⁷ = 3999023290049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3999023421101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16071966 + ... + 16318888.

It is an arithmetic number, because the mean of its divisors is an integer number (269811385560).

Almost surely, 2^{3999023421121} is an apocalyptic number.

It is an amenable number.

3999023421121 is a deficient number, since it is larger than the sum of its proper divisors (317958747839).

3999023421121 is a wasteful number, since it uses less digits than its factorization.

3999023421121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271256.

The product of its (nonzero) digits is 209952, while the sum is 46.

The spelling of 3999023421121 in words is "three trillion, nine hundred ninety-nine billion, twenty-three million, four hundred twenty-one thousand, one hundred twenty-one".