4021665087 has 64 divisors (see below), whose sum is σ = 6144399360. Its totient is φ = 2318284800.

The previous prime is 4021665079. The next prime is 4021665101. The reversal of 4021665087 is 7805661204.

It is not a de Polignac number, because 4021665087 - 2³ = 4021665079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021665007) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 16687287 + ... + 16687527.

It is an arithmetic number, because the mean of its divisors is an integer number (96006240).

Almost surely, 2^4021665087 is an apocalyptic number.

4021665087 is a deficient number, since it is larger than the sum of its proper divisors (2122734273).

4021665087 is a wasteful number, since it uses less digits than its factorization.

4021665087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 4021665087 is about 63416.5994594475. The cubic root of 4021665087 is about 1590.2618250843.

It can be divided in two parts, 402166 and 5087, that added together give a triangular number (407253 = T₉₀₂).

The spelling of 4021665087 in words is "four billion, twenty-one million, six hundred sixty-five thousand, eighty-seven".