21141899 has 12 divisors (see below), whose sum is σ = 22868976. Its totient is φ = 19507488.

The previous prime is 21141893. The next prime is 21141941. The reversal of 21141899 is 99814112.

It is a de Polignac number, because none of the positive numbers 2^k-21141899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21141893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18797 + ... + 19889.

It is an arithmetic number, because the mean of its divisors is an integer number (1905748).

Almost surely, 2^21141899 is an apocalyptic number.

21141899 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21141899 is a deficient number, since it is larger than the sum of its proper divisors (1727077).

21141899 is a wasteful number, since it uses less digits than its factorization.

21141899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1174 (or 1145 counting only the distinct ones).

The product of its digits is 5184, while the sum is 35.

The square root of 21141899 is about 4598.0320790530. The cubic root of 21141899 is about 276.5124336727.

The spelling of 21141899 in words is "twenty-one million, one hundred forty-one thousand, eight hundred ninety-nine".