21348680 has 32 divisors (see below), whose sum is σ = 48176640. Its totient is φ = 8514240.

The previous prime is 21348661. The next prime is 21348713. The reversal of 21348680 is 8684312.

It is a super-2 number, since 2×21348680² = 911532275484800, which contains 22 as substring.

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, 19097 + ... + 20183.

It is an arithmetic number, because the mean of its divisors is an integer number (1505520).

Almost surely, 2^21348680 is an apocalyptic number.

21348680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21348680 is an abundant number, since it is smaller than the sum of its proper divisors (26827960).

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

21348680 is a wasteful number, since it uses less digits than its factorization.

21348680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1589 (or 1585 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 21348680 is about 4620.4631802450. The cubic root of 21348680 is about 277.4109987015.

The spelling of 21348680 in words is "twenty-one million, three hundred forty-eight thousand, six hundred eighty".