21680348 has 12 divisors (see below), whose sum is σ = 38748192. Its totient is φ = 10609440.

The previous prime is 21680341. The next prime is 21680353. The reversal of 21680348 is 84308612.

It is a super-2 number, since 2×21680348² = 940074978802208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21680341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57473 + ... + 57848.

It is an arithmetic number, because the mean of its divisors is an integer number (3229016).

Almost surely, 2^21680348 is an apocalyptic number.

It is an amenable number.

21680348 is a deficient number, since it is larger than the sum of its proper divisors (17067844).

21680348 is a wasteful number, since it uses less digits than its factorization.

21680348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115372 (or 115370 counting only the distinct ones).

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

The square root of 21680348 is about 4656.2160602790. The cubic root of 21680348 is about 278.8402197458.

The spelling of 21680348 in words is "twenty-one million, six hundred eighty thousand, three hundred forty-eight".