21419233 has 16 divisors (see below), whose sum is σ = 25178112. Its totient is φ = 18018000.

The previous prime is 21419207. The next prime is 21419267. The reversal of 21419233 is 33291412.

It is not a de Polignac number, because 21419233 - 2¹⁷ = 21288161 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21419198 and 21419207.

It is not an unprimeable number, because it can be changed into a prime (21419533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6478 + ... + 9208.

It is an arithmetic number, because the mean of its divisors is an integer number (1573632).

Almost surely, 2^21419233 is an apocalyptic number.

21419233 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21419233 is a deficient number, since it is larger than the sum of its proper divisors (3758879).

21419233 is a wasteful number, since it uses less digits than its factorization.

21419233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2796.

The product of its digits is 1296, while the sum is 25.

The square root of 21419233 is about 4628.0917233780. The cubic root of 21419233 is about 277.7162581214.

The spelling of 21419233 in words is "twenty-one million, four hundred nineteen thousand, two hundred thirty-three".