21112212020 has 12 divisors (see below), whose sum is σ = 44335645284. Its totient is φ = 8444884800.

The previous prime is 21112211993. The next prime is 21112212067. The reversal of 21112212020 is 2021221112.

It can be written as a sum of positive squares in 2 ways, for example, as 6508939684 + 14603272336 = 80678^2 + 120844^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21112211986 and 21112212004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 527805281 + ... + 527805320.

It is an arithmetic number, because the mean of its divisors is an integer number (3694637107).

Almost surely, 2^21112212020 is an apocalyptic number.

21112212020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112212020 is an abundant number, since it is smaller than the sum of its proper divisors (23223433264).

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

21112212020 is a wasteful number, since it uses less digits than its factorization.

21112212020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055610610 (or 1055610608 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21112212020 its reverse (2021221112), we get a palindrome (23133433132).

The spelling of 21112212020 in words is "twenty-one billion, one hundred twelve million, two hundred twelve thousand, twenty".