21380502 has 32 divisors (see below), whose sum is σ = 50238720. Its totient is φ = 5980320.

The previous prime is 21380473. The next prime is 21380519. The reversal of 21380502 is 20508312.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 11602 + ... + 13317.

It is an arithmetic number, because the mean of its divisors is an integer number (1569960).

Almost surely, 2^21380502 is an apocalyptic number.

21380502 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21380502 is an abundant number, since it is smaller than the sum of its proper divisors (28858218).

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

21380502 is a wasteful number, since it uses less digits than its factorization.

21380502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24948.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21380502 is about 4623.9054921138. The cubic root of 21380502 is about 277.5487650685.

Adding to 21380502 its reverse (20508312), we get a palindrome (41888814).

The spelling of 21380502 in words is "twenty-one million, three hundred eighty thousand, five hundred two".