21423302 has 4 divisors (see below), whose sum is σ = 32134956. Its totient is φ = 10711650.

The previous prime is 21423293. The next prime is 21423307. The reversal of 21423302 is 20332412.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5355824 + ... + 5355827.

It is an arithmetic number, because the mean of its divisors is an integer number (8033739).

Almost surely, 2^21423302 is an apocalyptic number.

21423302 is a deficient number, since it is larger than the sum of its proper divisors (10711654).

21423302 is a wasteful number, since it uses less digits than its factorization.

21423302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10711653.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 21423302 is about 4628.5313005315. The cubic root of 21423302 is about 277.7338428766.

Adding to 21423302 its reverse (20332412), we get a palindrome (41755714).

The spelling of 21423302 in words is "twenty-one million, four hundred twenty-three thousand, three hundred two".