2112220220021 has 4 divisors (see below), whose sum is σ = 2112244011852. Its totient is φ = 2112196428192.

The previous prime is 2112220220017. The next prime is 2112220220027. The reversal of 2112220220021 is 1200220222112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 272708506225 + 1839511713796 = 522215^2 + 1356286^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112220220021 - 2² = 2112220220017 is a prime.

It is a super-2 number, since 2×2112220220021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112220220027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11762246 + ... + 11940471.

It is an arithmetic number, because the mean of its divisors is an integer number (528061002963).

Almost surely, 2^{2112220220021} is an apocalyptic number.

It is an amenable number.

2112220220021 is a deficient number, since it is larger than the sum of its proper divisors (23791831).

2112220220021 is an equidigital number, since it uses as much as digits as its factorization.

2112220220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23791830.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 2112220220021 its reverse (1200220222112), we get a palindrome (3312440442133).

The spelling of 2112220220021 in words is "two trillion, one hundred twelve billion, two hundred twenty million, two hundred twenty thousand, twenty-one".