21434073 has 4 divisors (see below), whose sum is σ = 28578768. Its totient is φ = 14289380.

The previous prime is 21434053. The next prime is 21434099. The reversal of 21434073 is 37043412.

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.

It is a cyclic number.

It is not a de Polignac number, because 21434073 - 2⁹ = 21433561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21434053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3572343 + ... + 3572348.

It is an arithmetic number, because the mean of its divisors is an integer number (7144692).

Almost surely, 2^21434073 is an apocalyptic number.

It is an amenable number.

21434073 is a deficient number, since it is larger than the sum of its proper divisors (7144695).

21434073 is an equidigital number, since it uses as much as digits as its factorization.

21434073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7144694.

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 21434073 is about 4629.6946983575. The cubic root of 21434073 is about 277.7803805208.

Adding to 21434073 its reverse (37043412), we get a palindrome (58477485).

It can be divided in two parts, 2143 and 4073, that added together give a triangular number (6216 = T₁₁₁).

The spelling of 21434073 in words is "twenty-one million, four hundred thirty-four thousand, seventy-three".