21231153760320 has 896 divisors, whose sum is σ = 90946428825600. Its totient is φ = 4554429825024.

The previous prime is 21231153760123. The next prime is 21231153760357. The reversal of 21231153760320 is 2306735113212.

21231153760320 is a `hidden beast` number, since 2 + 1 + 2 + 3 + 1 + 15 + 37 + 603 + 2 + 0 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 122869504 + ... + 123042176.

Almost surely, 2^{21231153760320} is an apocalyptic number.

21231153760320 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 21231153760320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45473214412800).

21231153760320 is an abundant number, since it is smaller than the sum of its proper divisors (69715275065280).

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

21231153760320 is a wasteful number, since it uses less digits than its factorization.

21231153760320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172832 (or 172816 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

Adding to 21231153760320 its reverse (2306735113212), we get a palindrome (23537888873532).

The spelling of 21231153760320 in words is "twenty-one trillion, two hundred thirty-one billion, one hundred fifty-three million, seven hundred sixty thousand, three hundred twenty".