21283670 has 32 divisors (see below), whose sum is σ = 40144896. Its totient is φ = 8114400.

The previous prime is 21283657. The next prime is 21283673. The reversal of 21283670 is 7638212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21283673) by changing a digit.

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, 21527 + ... + 22493.

It is an arithmetic number, because the mean of its divisors is an integer number (1254528).

Almost surely, 2^21283670 is an apocalyptic number.

21283670 is a deficient number, since it is larger than the sum of its proper divisors (18861226).

21283670 is a wasteful number, since it uses less digits than its factorization.

21283670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 21283670 is about 4613.4228074175. The cubic root of 21283670 is about 277.1291260677.

The spelling of 21283670 in words is "twenty-one million, two hundred eighty-three thousand, six hundred seventy".