21347136 has 42 divisors (see below), whose sum is σ = 61189362. Its totient is φ = 7115520.

The previous prime is 21347111. The next prime is 21347147. The reversal of 21347136 is 63174312.

It can be written as a sum of positive squares in only one way, i.e., 20793600 + 553536 = 4560^2 + 744^2 .

It is a congruent 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 5 ways as a sum of consecutive naturals, for example, 17955 + ... + 19106.

Almost surely, 2^21347136 is an apocalyptic number.

It is an amenable number.

21347136 is an abundant number, since it is smaller than the sum of its proper divisors (39842226).

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

21347136 is a wasteful number, since it uses less digits than its factorization.

21347136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37079 (or 37066 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 21347136 is about 4620.2960944078. The cubic root of 21347136 is about 277.4043108109.

The spelling of 21347136 in words is "twenty-one million, three hundred forty-seven thousand, one hundred thirty-six".