2122121202221 has 8 divisors (see below), whose sum is σ = 2242417562880. Its totient is φ = 2004160693392.

The previous prime is 2122121202209. The next prime is 2122121202263. The reversal of 2122121202221 is 1222021212212.

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 2122121202221 - 2¹⁰ = 2122121201197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2122121202193 and 2122121202202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122121202521) 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, 583961090 + ... + 583964723.

It is an arithmetic number, because the mean of its divisors is an integer number (280302195360).

Almost surely, 2^{2122121202221} is an apocalyptic number.

It is an amenable number.

2122121202221 is a deficient number, since it is larger than the sum of its proper divisors (120296360659).

2122121202221 is a wasteful number, since it uses less digits than its factorization.

2122121202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167925915.

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

Adding to 2122121202221 its reverse (1222021212212), we get a palindrome (3344142414433).

Subtracting from 2122121202221 its reverse (1222021212212), we obtain a palindrome (900099990009).

The spelling of 2122121202221 in words is "two trillion, one hundred twenty-two billion, one hundred twenty-one million, two hundred two thousand, two hundred twenty-one".