2101651440 has 80 divisors (see below), whose sum is σ = 7445856768. Its totient is φ = 480377088.

The previous prime is 2101651439. The next prime is 2101651451. The reversal of 2101651440 is 441561012.

It is a happy number.

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 (24).

It is a self number, because there is not a number n which added to its sum of digits gives 2101651440.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 623812 + ... + 627171.

Almost surely, 2^2101651440 is an apocalyptic number.

2101651440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101651440 is an abundant number, since it is smaller than the sum of its proper divisors (5344205328).

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

2101651440 is a wasteful number, since it uses less digits than its factorization.

2101651440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1251006 (or 1251000 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 2101651440 is about 45843.7720961092. The cubic root of 2101651440 is about 1280.9147595175.

The spelling of 2101651440 in words is "two billion, one hundred one million, six hundred fifty-one thousand, four hundred forty".