18420101 has 8 divisors (see below), whose sum is σ = 22159680. Its totient is φ = 14957568.

The previous prime is 18420071. The next prime is 18420119. The reversal of 18420101 is 10102481.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18420101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18420101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18420151) 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, 69116 + ... + 69381.

It is an arithmetic number, because the mean of its divisors is an integer number (2769960).

Almost surely, 2^18420101 is an apocalyptic number.

It is an amenable number.

18420101 is a deficient number, since it is larger than the sum of its proper divisors (3739579).

18420101 is a wasteful number, since it uses less digits than its factorization.

18420101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138523.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 18420101 is about 4291.8645132390. The cubic root of 18420101 is about 264.0973250360.

Adding to 18420101 its reverse (10102481), we get a palindrome (28522582).

The spelling of 18420101 in words is "eighteen million, four hundred twenty thousand, one hundred one".