22121222120221 has 16 divisors (see below), whose sum is σ = 26784634466304. Its totient is φ = 17834960611584.

The previous prime is 22121222120209. The next prime is 22121222120251. The reversal of 22121222120221 is 12202122212122.

It is a cyclic number.

It is not a de Polignac number, because 22121222120221 - 2¹⁷ = 22121221989149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22121222120192 and 22121222120201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121222120251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55692850 + ... + 56088643.

It is an arithmetic number, because the mean of its divisors is an integer number (1674039654144).

Almost surely, 2^{22121222120221} is an apocalyptic number.

It is an amenable number.

22121222120221 is a deficient number, since it is larger than the sum of its proper divisors (4663412346083).

22121222120221 is a wasteful number, since it uses less digits than its factorization.

22121222120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111783180.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 22121222120221 its reverse (12202122212122), we get a palindrome (34323344332343).

The spelling of 22121222120221 in words is "twenty-two trillion, one hundred twenty-one billion, two hundred twenty-two million, one hundred twenty thousand, two hundred twenty-one".