22001212110221 has 8 divisors (see below), whose sum is σ = 22231173860280. Its totient is φ = 21771314546688.

The previous prime is 22001212110209. The next prime is 22001212110239. The reversal of 22001212110221 is 12201121210022.

It can be written as a sum of positive squares in 4 ways, for example, as 6985501860100 + 15015710250121 = 2643010^2 + 3875011^2 .

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 22001212110221 - 2²⁶ = 22001145001357 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22001212110221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001212112221) 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, 15357356 + ... + 16728741.

It is an arithmetic number, because the mean of its divisors is an integer number (2778896732535).

Almost surely, 2^{22001212110221} is an apocalyptic number.

It is an amenable number.

22001212110221 is a deficient number, since it is larger than the sum of its proper divisors (229961750059).

22001212110221 is an equidigital number, since it uses as much as digits as its factorization.

22001212110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32093263.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 22001212110221 its reverse (12201121210022), we get a palindrome (34202333320243).

The spelling of 22001212110221 in words is "twenty-two trillion, one billion, two hundred twelve million, one hundred ten thousand, two hundred twenty-one".