2121023130320 has 20 divisors (see below), whose sum is σ = 4931378778180. Its totient is φ = 848409252096.

The previous prime is 2121023130301. The next prime is 2121023130337. The reversal of 2121023130320 is 230313201212.

It can be written as a sum of positive squares in 2 ways, for example, as 1545257831056 + 575765299264 = 1243084^2 + 758792^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2121023130292 and 2121023130301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13256394485 + ... + 13256394644.

It is an arithmetic number, because the mean of its divisors is an integer number (246568938909).

Almost surely, 2^{2121023130320} is an apocalyptic number.

2121023130320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121023130320 is an abundant number, since it is smaller than the sum of its proper divisors (2810355647860).

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

2121023130320 is a wasteful number, since it uses less digits than its factorization.

2121023130320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26512789142 (or 26512789136 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 2121023130320 its reverse (230313201212), we get a palindrome (2351336331532).

The spelling of 2121023130320 in words is "two trillion, one hundred twenty-one billion, twenty-three million, one hundred thirty thousand, three hundred twenty".