21240302 has 4 divisors (see below), whose sum is σ = 31860456. Its totient is φ = 10620150.

The previous prime is 21240283. The next prime is 21240311. The reversal of 21240302 is 20304212.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5310074 + ... + 5310077.

It is an arithmetic number, because the mean of its divisors is an integer number (7965114).

Almost surely, 2^21240302 is an apocalyptic number.

21240302 is a deficient number, since it is larger than the sum of its proper divisors (10620154).

21240302 is a wasteful number, since it uses less digits than its factorization.

21240302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10620153.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 21240302 is about 4608.7202128140. The cubic root of 21240302 is about 276.9407702647.

Adding to 21240302 its reverse (20304212), we get a palindrome (41544514).

The spelling of 21240302 in words is "twenty-one million, two hundred forty thousand, three hundred two".