21001112331320 has 32 divisors (see below), whose sum is σ = 51548184814320. Its totient is φ = 7636768120320.

The previous prime is 21001112331301. The next prime is 21001112331343. The reversal of 21001112331320 is 2313321110012.

It is a happy number.

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 = 21001112331292 and 21001112331301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23864899937 + ... + 23864900816.

Almost surely, 2^{21001112331320} is an apocalyptic number.

21001112331320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001112331320 is an abundant number, since it is smaller than the sum of its proper divisors (30547072483000).

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

21001112331320 is a wasteful number, since it uses less digits than its factorization.

21001112331320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47729800775 (or 47729800771 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21001112331320 its reverse (2313321110012), we get a palindrome (23314433441332).

The spelling of 21001112331320 in words is "twenty-one trillion, one billion, one hundred twelve million, three hundred thirty-one thousand, three hundred twenty".