21111110220 has 48 divisors (see below), whose sum is σ = 59118742368. Its totient is φ = 5628902400.

The previous prime is 21111110161. The next prime is 21111110231. The reversal of 21111110220 is 2201111112.

It is a super-3 number, since 3×21111110220³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21111110196 and 21111110205.

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, 576292 + ... + 611828.

It is an arithmetic number, because the mean of its divisors is an integer number (1231640466).

Almost surely, 2^21111110220 is an apocalyptic number.

21111110220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111110220 is an abundant number, since it is smaller than the sum of its proper divisors (38007632148).

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

21111110220 is a wasteful number, since it uses less digits than its factorization.

21111110220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45450 (or 45448 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21111110220 its reverse (2201111112), we get a palindrome (23312221332).

The spelling of 21111110220 in words is "twenty-one billion, one hundred eleven million, one hundred ten thousand, two hundred twenty".