22001112021221 has 8 divisors (see below), whose sum is σ = 22378974221688. Its totient is φ = 21623804280000.

The previous prime is 22001112021127. The next prime is 22001112021233. The reversal of 22001112021221 is 12212021110022.

It can be written as a sum of positive squares in 4 ways, for example, as 255808350625 + 21745303670596 = 505775^2 + 4663186^2 .

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 22001112021221 - 2¹⁰ = 22001112020197 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 22001112021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001112021281) 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, 138534770 + ... + 138693491.

It is an arithmetic number, because the mean of its divisors is an integer number (2797371777711).

Almost surely, 2^{22001112021221} is an apocalyptic number.

It is an amenable number.

22001112021221 is a deficient number, since it is larger than the sum of its proper divisors (377862200467).

22001112021221 is a wasteful number, since it uses less digits than its factorization.

22001112021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277229623.

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

Adding to 22001112021221 its reverse (12212021110022), we get a palindrome (34213133131243).

The spelling of 22001112021221 in words is "twenty-two trillion, one billion, one hundred twelve million, twenty-one thousand, two hundred twenty-one".