22212121022001 has 20 divisors (see below), whose sum is σ = 33181225635492. Its totient is φ = 14808011079168.

The previous prime is 22212121021991. The next prime is 22212121022011. The reversal of 22212121022001 is 10022012121222.

It is a happy number.

22212121022001 is a `hidden beast` number, since 2 + 221 + 212 + 10 + 220 + 0 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (22212121021991) and next prime (22212121022011).

It can be written as a sum of positive squares in 2 ways, for example, as 16587895334976 + 5624225687025 = 4072824^2 + 2371545^2 .

It is not a de Polignac number, because 22212121022001 - 2²⁵ = 22212087467569 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22212121022011) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 21264121 + ... + 22284233.

Almost surely, 2^{22212121022001} is an apocalyptic number.

It is an amenable number.

22212121022001 is a deficient number, since it is larger than the sum of its proper divisors (10969104613491).

22212121022001 is a wasteful number, since it uses less digits than its factorization.

22212121022001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288942 (or 1288933 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 22212121022001 its reverse (10022012121222), we get a palindrome (32234133143223).

The spelling of 22212121022001 in words is "twenty-two trillion, two hundred twelve billion, one hundred twenty-one million, twenty-two thousand, one".