3912000021 has 24 divisors (see below), whose sum is σ = 5775504384. Its totient is φ = 2550471840.

The previous prime is 3912000017. The next prime is 3912000031. The reversal of 3912000021 is 1200002193.

It is a happy number.

It is not a de Polignac number, because 3912000021 - 2² = 3912000017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3911999958 and 3912000003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3912000031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 672636 + ... + 678426.

It is an arithmetic number, because the mean of its divisors is an integer number (240646016).

Almost surely, 2^3912000021 is an apocalyptic number.

It is an amenable number.

3912000021 is a deficient number, since it is larger than the sum of its proper divisors (1863504363).

3912000021 is a wasteful number, since it uses less digits than its factorization.

3912000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7441 (or 7438 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 3912000021 is about 62545.9832523240. The cubic root of 3912000021 is about 1575.6736879116.

The spelling of 3912000021 in words is "three billion, nine hundred twelve million, twenty-one", and thus it is an aban number.