2021878417 has 16 divisors (see below), whose sum is σ = 2192496768. Its totient is φ = 1853464320.

The previous prime is 2021878409. The next prime is 2021878451. The reversal of 2021878417 is 7148781202.

It is a cyclic number.

It is not a de Polignac number, because 2021878417 - 2³ = 2021878409 is a prime.

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 2021878417.

It is not an unprimeable number, because it can be changed into a prime (2021872417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1575258 + ... + 1576540.

It is an arithmetic number, because the mean of its divisors is an integer number (137031048).

Almost surely, 2^2021878417 is an apocalyptic number.

It is an amenable number.

2021878417 is a deficient number, since it is larger than the sum of its proper divisors (170618351).

2021878417 is a wasteful number, since it uses less digits than its factorization.

2021878417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2040.

The product of its (nonzero) digits is 50176, while the sum is 40.

The square root of 2021878417 is about 44965.3023674922. The cubic root of 2021878417 is about 1264.4985784236.

The spelling of 2021878417 in words is "two billion, twenty-one million, eight hundred seventy-eight thousand, four hundred seventeen".