21111110211220 has 24 divisors (see below), whose sum is σ = 44894512857600. Its totient is φ = 8337552386592.

The previous prime is 21111110211211. The next prime is 21111110211227. The reversal of 21111110211220 is 2211201111112.

It is a super-3 number, since 3×21111110211220³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21111110211194 and 21111110211203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111110211227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6680729500 + ... + 6680732659.

It is an arithmetic number, because the mean of its divisors is an integer number (1870604702400).

Almost surely, 2^{21111110211220} is an apocalyptic number.

21111110211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111110211220 is an abundant number, since it is smaller than the sum of its proper divisors (23783402646380).

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

21111110211220 is a wasteful number, since it uses less digits than its factorization.

21111110211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13361462247 (or 13361462245 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 21111110211220 its reverse (2211201111112), we get a palindrome (23322311322332).

The spelling of 21111110211220 in words is "twenty-one trillion, one hundred eleven billion, one hundred ten million, two hundred eleven thousand, two hundred twenty".