21112020012220 has 48 divisors (see below), whose sum is σ = 45767435164416. Its totient is φ = 8172033408000.

The previous prime is 21112020012199. The next prime is 21112020012277. The reversal of 21112020012220 is 2221002021112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21112020012194 and 21112020012203.

It is a congruent number.

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, 13494310 + ... + 14977330.

It is an arithmetic number, because the mean of its divisors is an integer number (953488232592).

Almost surely, 2^{21112020012220} is an apocalyptic number.

21112020012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112020012220 is an abundant number, since it is smaller than the sum of its proper divisors (24655415152196).

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

21112020012220 is a wasteful number, since it uses less digits than its factorization.

21112020012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1506022 (or 1506020 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21112020012220 its reverse (2221002021112), we get a palindrome (23333022033332).

The spelling of 21112020012220 in words is "twenty-one trillion, one hundred twelve billion, twenty million, twelve thousand, two hundred twenty".