10221999 has 4 divisors (see below), whose sum is σ = 13629336. Its totient is φ = 6814664.

The previous prime is 10221973. The next prime is 10222001. The reversal of 10221999 is 99912201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 10221999 - 2¹³ = 10213807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221919) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1703664 + ... + 1703669.

It is an arithmetic number, because the mean of its divisors is an integer number (3407334).

Almost surely, 2^10221999 is an apocalyptic number.

10221999 is a deficient number, since it is larger than the sum of its proper divisors (3407337).

10221999 is an equidigital number, since it uses as much as digits as its factorization.

10221999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3407336.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 10221999 is about 3197.1861065631. The cubic root of 10221999 is about 217.0260892981.

The spelling of 10221999 in words is "ten million, two hundred twenty-one thousand, nine hundred ninety-nine".