21698064 has 40 divisors (see below), whose sum is σ = 62282720. Its totient is φ = 7232544.

The previous prime is 21698059. The next prime is 21698081. The reversal of 21698064 is 46089612.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 24682 + ... + 25545.

It is an arithmetic number, because the mean of its divisors is an integer number (1557068).

Almost surely, 2^21698064 is an apocalyptic number.

21698064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21698064 is an abundant number, since it is smaller than the sum of its proper divisors (40584656).

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

21698064 is a wasteful number, since it uses less digits than its factorization.

21698064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50244 (or 50232 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 21698064 is about 4658.1180749311. The cubic root of 21698064 is about 278.9161500829.

The spelling of 21698064 in words is "twenty-one million, six hundred ninety-eight thousand, sixty-four".