2112212021221 has 8 divisors (see below), whose sum is σ = 2126444949720. Its totient is φ = 2097988958208.

The previous prime is 2112212021131. The next prime is 2112212021267. The reversal of 2112212021221 is 1221202122112.

It can be written as a sum of positive squares in 4 ways, for example, as 1243381104900 + 868830916321 = 1115070^2 + 932111^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2112212021221 - 2¹⁷ = 2112211890149 is a prime.

It is a super-2 number, since 2×2112212021221² (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 (2112212021921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2036476 + ... + 2893381.

It is an arithmetic number, because the mean of its divisors is an integer number (265805618715).

Almost surely, 2^{2112212021221} is an apocalyptic number.

It is an amenable number.

2112212021221 is a deficient number, since it is larger than the sum of its proper divisors (14232928499).

2112212021221 is a wasteful number, since it uses less digits than its factorization.

2112212021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4932743.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 2112212021221 its reverse (1221202122112), we get a palindrome (3333414143333).

The spelling of 2112212021221 in words is "two trillion, one hundred twelve billion, two hundred twelve million, twenty-one thousand, two hundred twenty-one".