21321023003120 has 80 divisors (see below), whose sum is σ = 49697359656480. Its totient is φ = 8506755379200.

The previous prime is 21321023003083. The next prime is 21321023003171. The reversal of 21321023003120 is 2130032012312.

It is a tau number, because it is divible by the number of its divisors (80).

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 = 21321023003092 and 21321023003101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67321940 + ... + 67637900.

It is an arithmetic number, because the mean of its divisors is an integer number (621216995706).

Almost surely, 2^{21321023003120} is an apocalyptic number.

21321023003120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21321023003120 is an abundant number, since it is smaller than the sum of its proper divisors (28376336653360).

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

21321023003120 is a wasteful number, since it uses less digits than its factorization.

21321023003120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318114 (or 318108 counting only the distinct ones).

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

Adding to 21321023003120 its reverse (2130032012312), we get a palindrome (23451055015432).

The spelling of 21321023003120 in words is "twenty-one trillion, three hundred twenty-one billion, twenty-three million, three thousand, one hundred twenty".