2891721050340 has 96 divisors (see below), whose sum is σ = 8227579086720. Its totient is φ = 758764179456.

The previous prime is 2891721050327. The next prime is 2891721050377. The reversal of 2891721050340 is 430501271982.

It is a junction number, because it is equal to n+sod(n) for n = 2891721050292 and 2891721050301.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 429150 + ... + 2442869.

It is an arithmetic number, because the mean of its divisors is an integer number (85703948820).

Almost surely, 2^{2891721050340} is an apocalyptic number.

2891721050340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2891721050340 is an abundant number, since it is smaller than the sum of its proper divisors (5335858036380).

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

2891721050340 is a wasteful number, since it uses less digits than its factorization.

2891721050340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2872301 (or 2872299 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The spelling of 2891721050340 in words is "two trillion, eight hundred ninety-one billion, seven hundred twenty-one million, fifty thousand, three hundred forty".