21283136 has 28 divisors (see below), whose sum is σ = 48268128. Its totient is φ = 9121152.

The previous prime is 21283127. The next prime is 21283139. The reversal of 21283136 is 63138212.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21283139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23306 + ... + 24201.

Almost surely, 2^21283136 is an apocalyptic number.

It is an amenable number.

21283136 is an abundant number, since it is smaller than the sum of its proper divisors (26984992).

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

21283136 is an equidigital number, since it uses as much as digits as its factorization.

21283136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47526 (or 47516 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 21283136 is about 4613.3649324544. The cubic root of 21283136 is about 277.1268083566.

The spelling of 21283136 in words is "twenty-one million, two hundred eighty-three thousand, one hundred thirty-six".