222121011221021 has 16 divisors (see below), whose sum is σ = 244225480458240. Its totient is φ = 200335198074480.

The previous prime is 222121011220973. The next prime is 222121011221041. The reversal of 222121011221021 is 120122110121222.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222121011221021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222121011220984 and 222121011221002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222121011221041) 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, 94628660 + ... + 96947538.

It is an arithmetic number, because the mean of its divisors is an integer number (15264092528640).

Almost surely, 2^{222121011221021} is an apocalyptic number.

It is an amenable number.

222121011221021 is a deficient number, since it is larger than the sum of its proper divisors (22104469237219).

222121011221021 is a wasteful number, since it uses less digits than its factorization.

222121011221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2387584.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 222121011221021 its reverse (120122110121222), we get a palindrome (342243121342243).

The spelling of 222121011221021 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, eleven million, two hundred twenty-one thousand, twenty-one".