2107721868 has 72 divisors (see below), whose sum is σ = 5905557504. Its totient is φ = 582775200.

The previous prime is 2107721849. The next prime is 2107721881. The reversal of 2107721868 is 8681277012.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39588 + ... + 76043.

It is an arithmetic number, because the mean of its divisors is an integer number (82021632).

Almost surely, 2^2107721868 is an apocalyptic number.

2107721868 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2107721868 is an abundant number, since it is smaller than the sum of its proper divisors (3797835636).

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

2107721868 is a wasteful number, since it uses less digits than its factorization.

2107721868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115683 (or 115674 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 42.

The square root of 2107721868 is about 45909.9321280265. The cubic root of 2107721868 is about 1282.1468424083.

The spelling of 2107721868 in words is "two billion, one hundred seven million, seven hundred twenty-one thousand, eight hundred sixty-eight".