2121599460840 has 64 divisors (see below), whose sum is σ = 6367288469760. Its totient is φ = 565538515200.

The previous prime is 2121599460809. The next prime is 2121599460847. The reversal of 2121599460840 is 480649951212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2121599460847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3150336 + ... + 3764015.

It is an arithmetic number, because the mean of its divisors is an integer number (99488882340).

Almost surely, 2^{2121599460840} is an apocalyptic number.

2121599460840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121599460840 is an abundant number, since it is smaller than the sum of its proper divisors (4245689008920).

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

2121599460840 is a wasteful number, since it uses less digits than its factorization.

2121599460840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6916922 (or 6916918 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 51.

The spelling of 2121599460840 in words is "two trillion, one hundred twenty-one billion, five hundred ninety-nine million, four hundred sixty thousand, eight hundred forty".