21067700 has 36 divisors (see below), whose sum is σ = 45916332. Its totient is φ = 8390400.

The previous prime is 21067699. The next prime is 21067729. The reversal of 21067700 is 776012.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 17956 + 21049744 = 134^2 + 4588^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45470 + ... + 45930.

Almost surely, 2^21067700 is an apocalyptic number.

21067700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21067700 is an abundant number, since it is smaller than the sum of its proper divisors (24848632).

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

21067700 is a wasteful number, since it uses less digits than its factorization.

21067700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932 (or 925 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 21067700 is about 4589.9564268084. The cubic root of 21067700 is about 276.1885744825.

The spelling of 21067700 in words is "twenty-one million, sixty-seven thousand, seven hundred".