18852021 has 10 divisors (see below), whose sum is σ = 28161782. Its totient is φ = 12567960.

The previous prime is 18851969. The next prime is 18852077. The reversal of 18852021 is 12025881.

It can be written as a sum of positive squares in only one way, i.e., 13950225 + 4901796 = 3735^2 + 2214^2 .

It is not a de Polignac number, because 18852021 - 2⁶ = 18851957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18852121) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 116290 + ... + 116451.

Almost surely, 2^18852021 is an apocalyptic number.

It is an amenable number.

18852021 is a deficient number, since it is larger than the sum of its proper divisors (9309761).

18852021 is an equidigital number, since it uses as much as digits as its factorization.

18852021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232753 (or 232744 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 18852021 is about 4341.8914081308. The cubic root of 18852021 is about 266.1456087483.

The spelling of 18852021 in words is "eighteen million, eight hundred fifty-two thousand, twenty-one".