30221999 has 4 divisors (see below), whose sum is σ = 30533664. Its totient is φ = 29910336.

The previous prime is 30221969. The next prime is 30222011. The reversal of 30221999 is 99912203.

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 30221999 - 2¹⁶ = 30156463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30221909) 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, 155687 + ... + 155880.

It is an arithmetic number, because the mean of its divisors is an integer number (7633416).

Almost surely, 2^30221999 is an apocalyptic number.

30221999 is a deficient number, since it is larger than the sum of its proper divisors (311665).

30221999 is an equidigital number, since it uses as much as digits as its factorization.

30221999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311664.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 30221999 is about 5497.4538651998. The cubic root of 30221999 is about 311.4878150005.

The spelling of 30221999 in words is "thirty million, two hundred twenty-one thousand, nine hundred ninety-nine".