12222121321021 has 8 divisors (see below), whose sum is σ = 12230978811480. Its totient is φ = 12213264259392.

The previous prime is 12222121320973. The next prime is 12222121321031. The reversal of 12222121321021 is 12012312122221.

It can be written as a sum of positive squares in 4 ways, for example, as 28408900 + 12222092912121 = 5330^2 + 3496011^2 .

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 12222121321021 - 2²³ = 12222112932413 is a prime.

It is a super-2 number, since 2×12222121321021² (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 = 12222121320983 and 12222121321001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12222121321031) 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, 76647651 + ... + 76806943.

It is an arithmetic number, because the mean of its divisors is an integer number (1528872351435).

Almost surely, 2^{12222121321021} is an apocalyptic number.

It is an amenable number.

12222121321021 is a deficient number, since it is larger than the sum of its proper divisors (8857490459).

12222121321021 is a wasteful number, since it uses less digits than its factorization.

12222121321021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214415.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 12222121321021 its reverse (12012312122221), we get a palindrome (24234433443242).

The spelling of 12222121321021 in words is "twelve trillion, two hundred twenty-two billion, one hundred twenty-one million, three hundred twenty-one thousand, twenty-one".