18211941 has 12 divisors (see below), whose sum is σ = 28697760. Its totient is φ = 11037480.

The previous prime is 18211939. The next prime is 18211957. The reversal of 18211941 is 14911281.

It is not a de Polignac number, because 18211941 - 2¹ = 18211939 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18211901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91881 + ... + 92078.

It is an arithmetic number, because the mean of its divisors is an integer number (2391480).

Almost surely, 2^18211941 is an apocalyptic number.

18211941 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18211941 is a deficient number, since it is larger than the sum of its proper divisors (10485819).

18211941 is a wasteful number, since it uses less digits than its factorization.

18211941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183976 (or 183973 counting only the distinct ones).

The product of its digits is 576, while the sum is 27.

The square root of 18211941 is about 4267.5450788480. The cubic root of 18211941 is about 263.0987258686.

The spelling of 18211941 in words is "eighteen million, two hundred eleven thousand, nine hundred forty-one".