2212122221021 has 4 divisors (see below), whose sum is σ = 2213118226044. Its totient is φ = 2211126216000.

The previous prime is 2212122220999. The next prime is 2212122221039. The reversal of 2212122221021 is 1201222212122.

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 1593681532921 + 618440688100 = 1262411^2 + 786410^2 .

It is a cyclic number.

It is not a de Polignac number, because 2212122221021 - 2¹⁴ = 2212122204637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2212122220984 and 2212122221002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2212122221321) 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, 497999180 + ... + 498003621.

It is an arithmetic number, because the mean of its divisors is an integer number (553279556511).

Almost surely, 2^{2212122221021} is an apocalyptic number.

It is an amenable number.

2212122221021 is a deficient number, since it is larger than the sum of its proper divisors (996005023).

2212122221021 is an equidigital number, since it uses as much as digits as its factorization.

2212122221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996005022.

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

Adding to 2212122221021 its reverse (1201222212122), we get a palindrome (3413344433143).

The spelling of 2212122221021 in words is "two trillion, two hundred twelve billion, one hundred twenty-two million, two hundred twenty-one thousand, twenty-one".