21000212311320 has 128 divisors (see below), whose sum is σ = 76364408448000. Its totient is φ = 5090960557440.

The previous prime is 21000212311261. The next prime is 21000212311339. The reversal of 21000212311320 is 2311321200012.

21000212311320 is a `hidden beast` number, since 2 + 10 + 0 + 0 + 21 + 2 + 311 + 320 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21000212311293 and 21000212311302.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 883835440 + ... + 883859199.

It is an arithmetic number, because the mean of its divisors is an integer number (596596941000).

Almost surely, 2^{21000212311320} is an apocalyptic number.

21000212311320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000212311320 is an abundant number, since it is smaller than the sum of its proper divisors (55364196136680).

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

21000212311320 is a wasteful number, since it uses less digits than its factorization.

21000212311320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1767694670 (or 1767694660 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21000212311320 its reverse (2311321200012), we get a palindrome (23311533511332).

The spelling of 21000212311320 in words is "twenty-one trillion, two hundred twelve million, three hundred eleven thousand, three hundred twenty".