2231728321320 has 96 divisors (see below), whose sum is σ = 7352474898600. Its totient is φ = 586975113216.

The previous prime is 2231728321297. The next prime is 2231728321337. The reversal of 2231728321320 is 231238271322.

2231728321320 is a `hidden beast` number, since 2 + 2 + 3 + 1 + 7 + 2 + 8 + 321 + 320 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2102262206724 + 129466114596 = 1449918^2 + 359814^2 .

It is a super-3 number, since 3×2231728321320³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42434305 + ... + 42486864.

Almost surely, 2^{2231728321320} is an apocalyptic number.

2231728321320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2231728321320 is an abundant number, since it is smaller than the sum of its proper divisors (5120746577280).

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

2231728321320 is a wasteful number, since it uses less digits than its factorization.

2231728321320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84921259 (or 84921252 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The spelling of 2231728321320 in words is "two trillion, two hundred thirty-one billion, seven hundred twenty-eight million, three hundred twenty-one thousand, three hundred twenty".