22121002222121 has 4 divisors (see below), whose sum is σ = 24132002424144. Its totient is φ = 20110002020100.

The previous prime is 22121002222103. The next prime is 22121002222141. The reversal of 22121002222121 is 12122220012122.

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-22121002222121 is a prime.

It is a super-2 number, since 2×22121002222121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22121002222093 and 22121002222102.

It is not an unprimeable number, because it can be changed into a prime (22121002222141) 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, 1005500100995 + ... + 1005500101016.

It is an arithmetic number, because the mean of its divisors is an integer number (6033000606036).

Almost surely, 2^{22121002222121} is an apocalyptic number.

It is an amenable number.

22121002222121 is a deficient number, since it is larger than the sum of its proper divisors (2011000202023).

22121002222121 is a wasteful number, since it uses less digits than its factorization.

22121002222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2011000202022.

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

Adding to 22121002222121 its reverse (12122220012122), we get a palindrome (34243222234243).

The spelling of 22121002222121 in words is "twenty-two trillion, one hundred twenty-one billion, two million, two hundred twenty-two thousand, one hundred twenty-one".