18521010 has 48 divisors (see below), whose sum is σ = 50693760. Its totient is φ = 4678560.

The previous prime is 18520993. The next prime is 18521021. The reversal of 18521010 is 1012581.

It is a super-2 number, since 2×18521010² = 686055622840200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3706 + ... + 7125.

It is an arithmetic number, because the mean of its divisors is an integer number (1056120).

Almost surely, 2^18521010 is an apocalyptic number.

18521010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18521010 is an abundant number, since it is smaller than the sum of its proper divisors (32172750).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18521010 is a wasteful number, since it uses less digits than its factorization.

18521010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10863 (or 10860 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 18521010 is about 4303.6043033718. The cubic root of 18521010 is about 264.5787064036.

Adding to 18521010 its reverse (1012581), we get a palindrome (19533591).

The spelling of 18521010 in words is "eighteen million, five hundred twenty-one thousand, ten".