21414433 has 4 divisors (see below), whose sum is σ = 21423808. Its totient is φ = 21405060.

The previous prime is 21414431. The next prime is 21414457. The reversal of 21414433 is 33441412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21414433 - 2¹ = 21414431 is a prime.

It is a super-2 number, since 2×21414433² = 917155881422978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21414431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1228 + ... + 6658.

It is an arithmetic number, because the mean of its divisors is an integer number (5355952).

Almost surely, 2^21414433 is an apocalyptic number.

It is an amenable number.

21414433 is a deficient number, since it is larger than the sum of its proper divisors (9375).

21414433 is an equidigital number, since it uses as much as digits as its factorization.

21414433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9374.

The product of its digits is 1152, while the sum is 22.

The square root of 21414433 is about 4627.5731220587. The cubic root of 21414433 is about 277.6955113837.

Adding to 21414433 its reverse (33441412), we get a palindrome (54855845).

The spelling of 21414433 in words is "twenty-one million, four hundred fourteen thousand, four hundred thirty-three".