21336460 has 24 divisors (see below), whose sum is σ = 46352880. Its totient is φ = 8240064.

The previous prime is 21336409. The next prime is 21336467. The reversal of 21336460 is 6463312.

It is not an unprimeable number, because it can be changed into a prime (21336467) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17814 + ... + 18973.

It is an arithmetic number, because the mean of its divisors is an integer number (1931370).

Almost surely, 2^21336460 is an apocalyptic number.

21336460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21336460 is an abundant number, since it is smaller than the sum of its proper divisors (25016420).

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

21336460 is a wasteful number, since it uses less digits than its factorization.

21336460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36825 (or 36823 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 21336460 is about 4619.1406127114. The cubic root of 21336460 is about 277.3580585133.

Adding to 21336460 its reverse (6463312), we get a palindrome (27799772).

The spelling of 21336460 in words is "twenty-one million, three hundred thirty-six thousand, four hundred sixty".