2121575740 has 24 divisors (see below), whose sum is σ = 4477933152. Its totient is φ = 844320960.

The previous prime is 2121575711. The next prime is 2121575851. The reversal of 2121575740 is 475751212.

It is a junction number, because it is equal to n+sod(n) for n = 2121575696 and 2121575705.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 265296 + ... + 273175.

It is an arithmetic number, because the mean of its divisors is an integer number (186580548).

Almost surely, 2^2121575740 is an apocalyptic number.

2121575740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121575740 is an abundant number, since it is smaller than the sum of its proper divisors (2356357412).

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

2121575740 is a wasteful number, since it uses less digits than its factorization.

2121575740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538677 (or 538675 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 34.

The square root of 2121575740 is about 46060.5659973909. The cubic root of 2121575740 is about 1284.9498564817.

The spelling of 2121575740 in words is "two billion, one hundred twenty-one million, five hundred seventy-five thousand, seven hundred forty".