22212120001021 has 4 divisors (see below), whose sum is σ = 22978055173500. Its totient is φ = 21446184828544.

The previous prime is 22212120001003. The next prime is 22212120001063. The reversal of 22212120001021 is 12010002121222.

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 15988522059225 + 6223597941796 = 3998565^2 + 2494714^2 .

It is a cyclic number.

It is not a de Polignac number, because 22212120001021 - 2³⁵ = 22177760262653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22212120000986 and 22212120001004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22212120001081) 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, 382967586196 + ... + 382967586253.

It is an arithmetic number, because the mean of its divisors is an integer number (5744513793375).

Almost surely, 2^{22212120001021} is an apocalyptic number.

It is an amenable number.

22212120001021 is a deficient number, since it is larger than the sum of its proper divisors (765935172479).

22212120001021 is an equidigital number, since it uses as much as digits as its factorization.

22212120001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765935172478.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22212120001021 its reverse (12010002121222), we get a palindrome (34222122122243).

The spelling of 22212120001021 in words is "twenty-two trillion, two hundred twelve billion, one hundred twenty million, one thousand, twenty-one".