22021212101221 has 4 divisors (see below), whose sum is σ = 22021555908352. Its totient is φ = 22020868294092.

The previous prime is 22021212101201. The next prime is 22021212101263. The reversal of 22021212101221 is 12210121212022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22021212101221 - 2¹⁹ = 22021211576933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021212101201) 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, 171807471 + ... + 171935596.

It is an arithmetic number, because the mean of its divisors is an integer number (5505388977088).

Almost surely, 2^{22021212101221} is an apocalyptic number.

It is an amenable number.

22021212101221 is a deficient number, since it is larger than the sum of its proper divisors (343807131).

22021212101221 is an equidigital number, since it uses as much as digits as its factorization.

22021212101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343807130.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 22021212101221 its reverse (12210121212022), we get a palindrome (34231333313243).

The spelling of 22021212101221 in words is "twenty-two trillion, twenty-one billion, two hundred twelve million, one hundred one thousand, two hundred twenty-one".