222121222021 has 8 divisors (see below), whose sum is σ = 228064324824. Its totient is φ = 216203143680.

The previous prime is 222121222019. The next prime is 222121222031. The reversal of 222121222021 is 120222121222.

It can be written as a sum of positive squares in 4 ways, for example, as 78588225 + 222042633796 = 8865^2 + 471214^2 .

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 222121222021 - 2¹ = 222121222019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 222121222021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222121222031) 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, 6238126 + ... + 6273631.

It is an arithmetic number, because the mean of its divisors is an integer number (28508040603).

Almost surely, 2^222121222021 is an apocalyptic number.

It is an amenable number.

222121222021 is a deficient number, since it is larger than the sum of its proper divisors (5943102803).

222121222021 is a wasteful number, since it uses less digits than its factorization.

222121222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12512231.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 222121222021 its reverse (120222121222), we get a palindrome (342343343243).

The spelling of 222121222021 in words is "two hundred twenty-two billion, one hundred twenty-one million, two hundred twenty-two thousand, twenty-one".