10221818 has 4 divisors (see below), whose sum is σ = 15332730. Its totient is φ = 5110908.

The previous prime is 10221803. The next prime is 10221853. The reversal of 10221818 is 81812201.

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 only one way, i.e., 10195249 + 26569 = 3193^2 + 163^2 .

10221818 is a modest number, since divided by 1818 gives 1022 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 10221793 and 10221802.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2555453 + ... + 2555456.

Almost surely, 2^10221818 is an apocalyptic number.

10221818 is a deficient number, since it is larger than the sum of its proper divisors (5110912).

10221818 is an equidigital number, since it uses as much as digits as its factorization.

10221818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5110911.

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 10221818 is about 3197.1578002970. The cubic root of 10221818 is about 217.0248083369.

The spelling of 10221818 in words is "ten million, two hundred twenty-one thousand, eight hundred eighteen".