1021100222 has 4 divisors (see below), whose sum is σ = 1531650336. Its totient is φ = 510550110.

The previous prime is 1021100209. The next prime is 1021100263. The reversal of 1021100222 is 2220011201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2220011201 = 4019 ⋅552379.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255275054 + ... + 255275057.

It is an arithmetic number, because the mean of its divisors is an integer number (382912584).

Almost surely, 2^1021100222 is an apocalyptic number.

1021100222 is a deficient number, since it is larger than the sum of its proper divisors (510550114).

1021100222 is an equidigital number, since it uses as much as digits as its factorization.

1021100222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510550113.

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

The square root of 1021100222 is about 31954.6588465594. The cubic root of 1021100222 is about 1006.9845103722.

Adding to 1021100222 its reverse (2220011201), we get a palindrome (3241111423).

The spelling of 1021100222 in words is "one billion, twenty-one million, one hundred thousand, two hundred twenty-two".