3815700021 has 48 divisors (see below), whose sum is σ = 6591242880. Its totient is φ = 2175284160.

The previous prime is 3815700019. The next prime is 3815700043. The reversal of 3815700021 is 1200075183.

It is not a de Polignac number, because 3815700021 - 2¹ = 3815700019 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 (3815702021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 601456 + ... + 607766.

It is an arithmetic number, because the mean of its divisors is an integer number (137317560).

Almost surely, 2^3815700021 is an apocalyptic number.

It is an amenable number.

3815700021 is a deficient number, since it is larger than the sum of its proper divisors (2775542859).

3815700021 is a wasteful number, since it uses less digits than its factorization.

3815700021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6791 (or 6778 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 3815700021 is about 61771.3527535216. The cubic root of 3815700021 is about 1562.6368975393.

The spelling of 3815700021 in words is "three billion, eight hundred fifteen million, seven hundred thousand, twenty-one".