222021021121 has 4 divisors (see below), whose sum is σ = 222281304532. Its totient is φ = 221760737712.

The previous prime is 222021021107. The next prime is 222021021181. The reversal of 222021021121 is 121120120222.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47551908096 + 174469113025 = 218064^2 + 417695^2 .

It is a cyclic number.

It is not a de Polignac number, because 222021021121 - 2⁷ = 222021020993 is a prime.

It is a super-2 number, since 2×222021021121² (a number of 23 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 = 222021021095 and 222021021104.

It is not an unprimeable number, because it can be changed into a prime (222021021181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130140426 + ... + 130142131.

It is an arithmetic number, because the mean of its divisors is an integer number (55570326133).

Almost surely, 2^222021021121 is an apocalyptic number.

It is an amenable number.

222021021121 is a deficient number, since it is larger than the sum of its proper divisors (260283411).

222021021121 is an equidigital number, since it uses as much as digits as its factorization.

222021021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260283410.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 222021021121 its reverse (121120120222), we get a palindrome (343141141343).

The spelling of 222021021121 in words is "two hundred twenty-two billion, twenty-one million, twenty-one thousand, one hundred twenty-one".