222000001021 has 4 divisors (see below), whose sum is σ = 229655173500. Its totient is φ = 214344828544.

The previous prime is 222000000953. The next prime is 222000001031. The reversal of 222000001021 is 120100000222.

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 162780778521 + 59219222500 = 403461^2 + 243350^2 .

It is a cyclic number.

It is not a de Polignac number, because 222000001021 - 2¹³ = 221999992829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222000000989 and 222000001007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222000001031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3827586196 + ... + 3827586253.

It is an arithmetic number, because the mean of its divisors is an integer number (57413793375).

Almost surely, 2^222000001021 is an apocalyptic number.

It is an amenable number.

222000001021 is a deficient number, since it is larger than the sum of its proper divisors (7655172479).

222000001021 is an equidigital number, since it uses as much as digits as its factorization.

222000001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7655172478.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 222000001021 its reverse (120100000222), we get a palindrome (342100001243).

The spelling of 222000001021 in words is "two hundred twenty-two billion, one thousand, twenty-one".