21112220212020 has 216 divisors, whose sum is σ = 75393521540064. Its totient is φ = 4767509803392.

The previous prime is 21112220212007. The next prime is 21112220212021. The reversal of 21112220212020 is 2021202221112.

It is a happy number.

21112220212020 is a `hidden beast` number, since 211 + 1 + 2 + 220 + 212 + 0 + 20 = 666.

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 = 21112220211984 and 21112220212002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112220212021) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 13687674 + ... + 15151793.

It is an arithmetic number, because the mean of its divisors is an integer number (349044081204).

Almost surely, 2^{21112220212020} is an apocalyptic number.

21112220212020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112220212020 is an abundant number, since it is smaller than the sum of its proper divisors (54281301328044).

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

21112220212020 is a wasteful number, since it uses less digits than its factorization.

21112220212020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28839579 (or 28839567 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21112220212020 its reverse (2021202221112), we get a palindrome (23133422433132).

The spelling of 21112220212020 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty million, two hundred twelve thousand, twenty".