21113112220 has 24 divisors (see below), whose sum is σ = 44835714000. Its totient is φ = 8350353792.

The previous prime is 21113112211. The next prime is 21113112239. The reversal of 21113112220 is 2221131112.

It is a super-2 number, since 2×21113112220² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21113112194 and 21113112203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5928870 + ... + 5932429.

It is an arithmetic number, because the mean of its divisors is an integer number (1868154750).

Almost surely, 2^21113112220 is an apocalyptic number.

21113112220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113112220 is an abundant number, since it is smaller than the sum of its proper divisors (23722601780).

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

21113112220 is a wasteful number, since it uses less digits than its factorization.

21113112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11861397 (or 11861395 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21113112220 its reverse (2221131112), we get a palindrome (23334243332).

The spelling of 21113112220 in words is "twenty-one billion, one hundred thirteen million, one hundred twelve thousand, two hundred twenty".