2101878416 has 30 divisors (see below), whose sum is σ = 4476266886. Its totient is φ = 955398400.

The previous prime is 2101878413. The next prime is 2101878431. The reversal of 2101878416 is 6148781012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1971004816 + 130873600 = 44396^2 + 11440^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2101878416.

It is not an unprimeable number, because it can be changed into a prime (2101878413) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 540905 + ... + 544776.

Almost surely, 2^2101878416 is an apocalyptic number.

It is an amenable number.

2101878416 is an abundant number, since it is smaller than the sum of its proper divisors (2374388470).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2101878416 is a wasteful number, since it uses less digits than its factorization.

2101878416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085711 (or 1085694 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 38.

The square root of 2101878416 is about 45846.2475672764. The cubic root of 2101878416 is about 1280.9608703103.

The spelling of 2101878416 in words is "two billion, one hundred one million, eight hundred seventy-eight thousand, four hundred sixteen".