18121010 has 16 divisors (see below), whose sum is σ = 34036416. Its totient is φ = 6933168.

The previous prime is 18120989. The next prime is 18121039. The reversal of 18121010 is 1012181.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39164 + ... + 39623.

It is an arithmetic number, because the mean of its divisors is an integer number (2127276).

Almost surely, 2^18121010 is an apocalyptic number.

18121010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18121010 is a deficient number, since it is larger than the sum of its proper divisors (15915406).

18121010 is a wasteful number, since it uses less digits than its factorization.

18121010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78817.

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 18121010 is about 4256.8779639543. The cubic root of 18121010 is about 262.6601169773.

Adding to 18121010 its reverse (1012181), we get a palindrome (19133191).

The spelling of 18121010 in words is "eighteen million, one hundred twenty-one thousand, ten".