2101974540 has 48 divisors (see below), whose sum is σ = 5889746688. Its totient is φ = 560124864.

The previous prime is 2101974509. The next prime is 2101974557. The reversal of 2101974540 is 454791012.

It is a happy 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, 77169 + ... + 100791.

It is an arithmetic number, because the mean of its divisors is an integer number (122703056).

Almost surely, 2^2101974540 is an apocalyptic number.

2101974540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101974540 is an abundant number, since it is smaller than the sum of its proper divisors (3787772148).

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

2101974540 is a wasteful number, since it uses less digits than its factorization.

2101974540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25118 (or 25116 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 2101974540 is about 45847.2958853627. The cubic root of 2101974540 is about 1280.9803971622.

It can be divided in two parts, 21019 and 74540, that added together give a palindrome (95559).

The spelling of 2101974540 in words is "two billion, one hundred one million, nine hundred seventy-four thousand, five hundred forty".