2212021222121 has 4 divisors (see below), whose sum is σ = 2242322882772. Its totient is φ = 2181719561472.

The previous prime is 2212021222109. The next prime is 2212021222127. The reversal of 2212021222121 is 1212221202122.

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 1333563040000 + 878458182121 = 1154800^2 + 937261^2 .

It is a cyclic number.

It is not a de Polignac number, because 2212021222121 - 2⁶ = 2212021222057 is a prime.

It is a super-2 number, since 2×2212021222121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2212021222093 and 2212021222102.

It is not an unprimeable number, because it can be changed into a prime (2212021222127) 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, 15150830216 + ... + 15150830361.

It is an arithmetic number, because the mean of its divisors is an integer number (560580720693).

Almost surely, 2^{2212021222121} is an apocalyptic number.

It is an amenable number.

2212021222121 is a deficient number, since it is larger than the sum of its proper divisors (30301660651).

2212021222121 is an equidigital number, since it uses as much as digits as its factorization.

2212021222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30301660650.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 2212021222121 its reverse (1212221202122), we get a palindrome (3424242424243).

The spelling of 2212021222121 in words is "two trillion, two hundred twelve billion, twenty-one million, two hundred twenty-two thousand, one hundred twenty-one".