222101021 has 4 divisors (see below), whose sum is σ = 223022844. Its totient is φ = 221179200.

The previous prime is 222101017. The next prime is 222101023. The reversal of 222101021 is 120101222.

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 178356025 + 43744996 = 13355^2 + 6614^2 .

It is a cyclic number.

It is not a de Polignac number, because 222101021 - 2² = 222101017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222100993 and 222101011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222101023) 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, 460550 + ... + 461031.

It is an arithmetic number, because the mean of its divisors is an integer number (55755711).

Almost surely, 2^222101021 is an apocalyptic number.

It is an amenable number.

222101021 is a deficient number, since it is larger than the sum of its proper divisors (921823).

222101021 is an equidigital number, since it uses as much as digits as its factorization.

222101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921822.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 222101021 is about 14903.0540829724. The cubic root of 222101021 is about 605.5967256332.

Adding to 222101021 its reverse (120101222), we get a palindrome (342202243).

The spelling of 222101021 in words is "two hundred twenty-two million, one hundred one thousand, twenty-one".