2121354536320 has 128 divisors (see below), whose sum is σ = 5372107725600. Its totient is φ = 798266327040.

The previous prime is 2121354536311. The next prime is 2121354536339. The reversal of 2121354536320 is 236354531212.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 2121354536320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24643755 + ... + 24729685.

Almost surely, 2^{2121354536320} is an apocalyptic number.

2121354536320 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 2121354536320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2686053862800).

2121354536320 is an abundant number, since it is smaller than the sum of its proper divisors (3250753189280).

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

2121354536320 is a wasteful number, since it uses less digits than its factorization.

2121354536320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88236 (or 88224 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 37.

The spelling of 2121354536320 in words is "two trillion, one hundred twenty-one billion, three hundred fifty-four million, five hundred thirty-six thousand, three hundred twenty".