21074535 has 12 divisors (see below), whose sum is σ = 36529272. Its totient is φ = 11239728.

The previous prime is 21074527. The next prime is 21074569. The reversal of 21074535 is 53547012.

It is a happy number.

It is not a de Polignac number, because 21074535 - 2³ = 21074527 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21074499 and 21074508.

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 11 ways as a sum of consecutive naturals, for example, 234117 + ... + 234206.

It is an arithmetic number, because the mean of its divisors is an integer number (3044106).

Almost surely, 2^21074535 is an apocalyptic number.

21074535 is a deficient number, since it is larger than the sum of its proper divisors (15454737).

21074535 is a wasteful number, since it uses less digits than its factorization.

21074535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468334 (or 468331 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 21074535 is about 4590.7009268738. The cubic root of 21074535 is about 276.2184392327.

It can be divided in two parts, 21074 and 535, that added together give a square (21609 = 147²).

The spelling of 21074535 in words is "twenty-one million, seventy-four thousand, five hundred thirty-five".