18211050 has 144 divisors (see below), whose sum is σ = 57683808. Its totient is φ = 4060800.

The previous prime is 18211049. The next prime is 18211051. The reversal of 18211050 is 5011281.

It is an interprime number because it is at equal distance from previous prime (18211049) and next prime (18211051).

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18211051) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 64209 + ... + 64491.

It is an arithmetic number, because the mean of its divisors is an integer number (400582).

Almost surely, 2^18211050 is an apocalyptic number.

18211050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18211050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28841904).

18211050 is an abundant number, since it is smaller than the sum of its proper divisors (39472758).

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

18211050 is a wasteful number, since it uses less digits than its factorization.

18211050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325 (or 317 counting only the distinct ones).

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

The square root of 18211050 is about 4267.4406850008. The cubic root of 18211050 is about 263.0944351894.

The spelling of 18211050 in words is "eighteen million, two hundred eleven thousand, fifty".