21404302 has 4 divisors (see below), whose sum is σ = 32106456. Its totient is φ = 10702150.

The previous prime is 21404269. The next prime is 21404303. The reversal of 21404302 is 20340412.

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 (21404303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5351074 + ... + 5351077.

It is an arithmetic number, because the mean of its divisors is an integer number (8026614).

Almost surely, 2^21404302 is an apocalyptic number.

21404302 is a deficient number, since it is larger than the sum of its proper divisors (10702154).

21404302 is a wasteful number, since it uses less digits than its factorization.

21404302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10702153.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 21404302 is about 4626.4783583196. The cubic root of 21404302 is about 277.6517126211.

Adding to 21404302 its reverse (20340412), we get a palindrome (41744714).

The spelling of 21404302 in words is "twenty-one million, four hundred four thousand, three hundred two".