21040302 has 16 divisors (see below), whose sum is σ = 42976512. Its totient is φ = 6864120.

The previous prime is 21040297. The next prime is 21040387. The reversal of 21040302 is 20304012.

It is a plaindrome in base 13.

It is a zygodrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37024 + ... + 37587.

It is an arithmetic number, because the mean of its divisors is an integer number (2686032).

Almost surely, 2^21040302 is an apocalyptic number.

21040302 is an abundant number, since it is smaller than the sum of its proper divisors (21936210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21040302 is a wasteful number, since it uses less digits than its factorization.

21040302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74663.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 21040302 is about 4586.9708959181. The cubic root of 21040302 is about 276.0687971746.

Adding to 21040302 its reverse (20304012), we get a palindrome (41344314).

The spelling of 21040302 in words is "twenty-one million, forty thousand, three hundred two".