18021099 has 8 divisors (see below), whose sum is σ = 24614352. Its totient is φ = 11720960.

The previous prime is 18021083. The next prime is 18021131. The reversal of 18021099 is 99012081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18021099 - 2⁴ = 18021083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18021599) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73134 + ... + 73379.

It is an arithmetic number, because the mean of its divisors is an integer number (3076794).

Almost surely, 2^18021099 is an apocalyptic number.

18021099 is a deficient number, since it is larger than the sum of its proper divisors (6593253).

18021099 is a wasteful number, since it uses less digits than its factorization.

18021099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146557.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 18021099 is about 4245.1264998820. The cubic root of 18021099 is about 262.1764976278.

The spelling of 18021099 in words is "eighteen million, twenty-one thousand, ninety-nine".