2051321004520 has 128 divisors (see below), whose sum is σ = 4757170176000. Its totient is φ = 795630608640.

The previous prime is 2051321004433. The next prime is 2051321004569. The reversal of 2051321004520 is 254001231502.

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 31 ways as a sum of consecutive naturals, for example, 194267001 + ... + 194277559.

It is an arithmetic number, because the mean of its divisors is an integer number (37165392000).

Almost surely, 2^{2051321004520} is an apocalyptic number.

2051321004520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2051321004520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2378585088000).

2051321004520 is an abundant number, since it is smaller than the sum of its proper divisors (2705849171480).

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

2051321004520 is a wasteful number, since it uses less digits than its factorization.

2051321004520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11423 (or 11419 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The spelling of 2051321004520 in words is "two trillion, fifty-one billion, three hundred twenty-one million, four thousand, five hundred twenty".