2102661840 has 80 divisors (see below), whose sum is σ = 6801671808. Its totient is φ = 536329728.

The previous prime is 2102661839. The next prime is 2102661857. The reversal of 2102661840 is 481662012.

2102661840 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 2102661798 and 2102661807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184939 + ... + 195978.

Almost surely, 2^2102661840 is an apocalyptic number.

2102661840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2102661840 is an abundant number, since it is smaller than the sum of its proper divisors (4699009968).

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

2102661840 is a wasteful number, since it uses less digits than its factorization.

2102661840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380956 (or 380950 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 2102661840 is about 45854.7908075045. The cubic root of 2102661840 is about 1281.1199995327.

The spelling of 2102661840 in words is "two billion, one hundred two million, six hundred sixty-one thousand, eight hundred forty".