3990012121 has 4 divisors (see below), whose sum is σ = 3996179712. Its totient is φ = 3983844532.

The previous prime is 3990012119. The next prime is 3990012127. The reversal of 3990012121 is 1212100993.

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 3990012121 - 2¹ = 3990012119 is a prime.

It is a super-3 number, since 3×3990012121³ (a number of 30 digits) contains 333 as substring.

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 3990012121.

It is not an unprimeable number, because it can be changed into a prime (3990012127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3082825 + ... + 3084118.

It is an arithmetic number, because the mean of its divisors is an integer number (999044928).

Almost surely, 2^3990012121 is an apocalyptic number.

It is an amenable number.

3990012121 is a deficient number, since it is larger than the sum of its proper divisors (6167591).

3990012121 is an equidigital number, since it uses as much as digits as its factorization.

3990012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6167590.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 3990012121 is about 63166.5427342672. The cubic root of 3990012121 is about 1586.0787199464.

The spelling of 3990012121 in words is "three billion, nine hundred ninety million, twelve thousand, one hundred twenty-one".