21068370 has 32 divisors (see below), whose sum is σ = 56183040. Its totient is φ = 5618160.

The previous prime is 21068357. The next prime is 21068417. The reversal of 21068370 is 7386012.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38746 + ... + 39285.

It is an arithmetic number, because the mean of its divisors is an integer number (1755720).

Almost surely, 2^21068370 is an apocalyptic number.

21068370 is an abundant number, since it is smaller than the sum of its proper divisors (35114670).

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

21068370 is a wasteful number, since it uses less digits than its factorization.

21068370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78047 (or 78041 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 21068370 is about 4590.0294116705. The cubic root of 21068370 is about 276.1915022563.

The spelling of 21068370 in words is "twenty-one million, sixty-eight thousand, three hundred seventy".