21000313323220 has 96 divisors (see below), whose sum is σ = 54994211112960. Its totient is φ = 6544174515840.

The previous prime is 21000313323203. The next prime is 21000313323247. The reversal of 21000313323220 is 2232331300012.

It is a super-2 number, since 2×21000313323220² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21000313323191 and 21000313323200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5896147 + ... + 8761573.

It is an arithmetic number, because the mean of its divisors is an integer number (572856365760).

Almost surely, 2^{21000313323220} is an apocalyptic number.

21000313323220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000313323220 is an abundant number, since it is smaller than the sum of its proper divisors (33993897789740).

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

21000313323220 is a wasteful number, since it uses less digits than its factorization.

21000313323220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2870213 (or 2870211 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21000313323220 its reverse (2232331300012), we get a palindrome (23232644623232).

The spelling of 21000313323220 in words is "twenty-one trillion, three hundred thirteen million, three hundred twenty-three thousand, two hundred twenty".