21694148 has 12 divisors (see below), whose sum is σ = 43388352. Its totient is φ = 9297480.

The previous prime is 21694139. The next prime is 21694151. The reversal of 21694148 is 84149612.

It is a happy number.

21694148 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387368 + ... + 387423.

It is an arithmetic number, because the mean of its divisors is an integer number (3615696).

Almost surely, 2^21694148 is an apocalyptic number.

21694148 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21694148 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21694148 is a wasteful number, since it uses less digits than its factorization.

21694148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774802 (or 774800 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 21694148 is about 4657.6977145367. The cubic root of 21694148 is about 278.8993697631.

The spelling of 21694148 in words is "twenty-one million, six hundred ninety-four thousand, one hundred forty-eight".