22021221212121 has 8 divisors (see below), whose sum is σ = 30638220816960. Its totient is φ = 14042517874352.

The previous prime is 22021221212063. The next prime is 22021221212129. The reversal of 22021221212121 is 12121212212022.

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 22021221212121 - 2¹³ = 22021221203929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22021221212129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159574066686 + ... + 159574066823.

It is an arithmetic number, because the mean of its divisors is an integer number (3829777602120).

Almost surely, 2^{22021221212121} is an apocalyptic number.

It is an amenable number.

22021221212121 is a deficient number, since it is larger than the sum of its proper divisors (8616999604839).

22021221212121 is a wasteful number, since it uses less digits than its factorization.

22021221212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319148133535.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 22021221212121 its reverse (12121212212022), we get a palindrome (34142433424143).

Subtracting from 22021221212121 its reverse (12121212212022), we obtain a palindrome (9900009000099).

The spelling of 22021221212121 in words is "twenty-two trillion, twenty-one billion, two hundred twenty-one million, two hundred twelve thousand, one hundred twenty-one".