21535754 has 8 divisors (see below), whose sum is σ = 32326500. Its totient is φ = 10760256.

The previous prime is 21535711. The next prime is 21535757. The reversal of 21535754 is 45753512.

It can be written as a sum of positive squares in 2 ways, for example, as 13890529 + 7645225 = 3727^2 + 2765^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21535754.

It is not an unprimeable number, because it can be changed into a prime (21535757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 872 + ... + 6620.

Almost surely, 2^21535754 is an apocalyptic number.

21535754 is a deficient number, since it is larger than the sum of its proper divisors (10790746).

21535754 is a wasteful number, since it uses less digits than its factorization.

21535754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7624.

The product of its digits is 21000, while the sum is 32.

The square root of 21535754 is about 4640.6630991702. The cubic root of 21535754 is about 278.2189414429.

The spelling of 21535754 in words is "twenty-one million, five hundred thirty-five thousand, seven hundred fifty-four".