3990201021 has 40 divisors (see below), whose sum is σ = 6048149184. Its totient is φ = 2621341440.

The previous prime is 3990201011. The next prime is 3990201037. The reversal of 3990201021 is 1201020993.

It is not a de Polignac number, because 3990201021 - 2⁶ = 3990200957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3990201011) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2065426 + ... + 2067356.

Almost surely, 2^3990201021 is an apocalyptic number.

It is an amenable number.

3990201021 is a deficient number, since it is larger than the sum of its proper divisors (2057948163).

3990201021 is a wasteful number, since it uses less digits than its factorization.

3990201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2303 (or 2294 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 3990201021 is about 63168.0379701634. The cubic root of 3990201021 is about 1586.1037495731.

The spelling of 3990201021 in words is "three billion, nine hundred ninety million, two hundred one thousand, twenty-one".