20212222100220 has 144 divisors (see below), whose sum is σ = 61485429952128. Its totient is φ = 5374543104000.

The previous prime is 20212222100171. The next prime is 20212222100251. The reversal of 20212222100220 is 2200122221202.

20212222100220 is a `hidden beast` number, since 2 + 0 + 212 + 22 + 210 + 0 + 220 = 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 = 20212222100193 and 20212222100202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 693681492 + ... + 693710628.

Almost surely, 2^{20212222100220} is an apocalyptic number.

20212222100220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20212222100220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30742714976064).

20212222100220 is an abundant number, since it is smaller than the sum of its proper divisors (41273207851908).

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

20212222100220 is a wasteful number, since it uses less digits than its factorization.

20212222100220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40020 (or 40015 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 20212222100220 its reverse (2200122221202), we get a palindrome (22412344321422).

The spelling of 20212222100220 in words is "twenty trillion, two hundred twelve billion, two hundred twenty-two million, one hundred thousand, two hundred twenty".