21003311220120 has 80 divisors (see below), whose sum is σ = 70594462722960. Its totient is φ = 5600882991168.

The previous prime is 21003311220043. The next prime is 21003311220169. The reversal of 21003311220120 is 2102211330012.

21003311220120 is a `hidden beast` number, since 2 + 10 + 0 + 3 + 311 + 220 + 120 = 666.

It is a super-2 number, since 2×21003311220120² (a number of 27 digits) contains 22 as substring.

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 = 21003311220093 and 21003311220102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3241248492 + ... + 3241254971.

It is an arithmetic number, because the mean of its divisors is an integer number (882430784037).

Almost surely, 2^{21003311220120} is an apocalyptic number.

21003311220120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21003311220120 is an abundant number, since it is smaller than the sum of its proper divisors (49591151502840).

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

21003311220120 is a wasteful number, since it uses less digits than its factorization.

21003311220120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6482503486 (or 6482503473 counting only the distinct ones).

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

Adding to 21003311220120 its reverse (2102211330012), we get a palindrome (23105522550132).

The spelling of 21003311220120 in words is "twenty-one trillion, three billion, three hundred eleven million, two hundred twenty thousand, one hundred twenty".