22001221222121 has 4 divisors (see below), whose sum is σ = 22002121349712. Its totient is φ = 22000321094532.

The previous prime is 22001221222109. The next prime is 22001221222153. The reversal of 22001221222121 is 12122212210022.

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 a de Polignac number, because none of the positive numbers 2^k-22001221222121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22001221222093 and 22001221222102.

It is not an unprimeable number, because it can be changed into a prime (22001221222021) 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, 450027131 + ... + 450076016.

It is an arithmetic number, because the mean of its divisors is an integer number (5500530337428).

Almost surely, 2^{22001221222121} is an apocalyptic number.

It is an amenable number.

22001221222121 is a deficient number, since it is larger than the sum of its proper divisors (900127591).

22001221222121 is an equidigital number, since it uses as much as digits as its factorization.

22001221222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900127590.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 22001221222121 its reverse (12122212210022), we get a palindrome (34123433432143).

It can be divided in two parts, 2200122 and 1222121, that added together give a palindrome (3422243).

The spelling of 22001221222121 in words is "twenty-two trillion, one billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred twenty-one".