21052735 has 8 divisors (see below), whose sum is σ = 27560016. Its totient is φ = 15311040.

The previous prime is 21052729. The next prime is 21052739. The reversal of 21052735 is 53725012.

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

It is not a de Polignac number, because 21052735 - 2¹⁵ = 21019967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21052739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191334 + ... + 191443.

It is an arithmetic number, because the mean of its divisors is an integer number (3445002).

Almost surely, 2^21052735 is an apocalyptic number.

21052735 is a deficient number, since it is larger than the sum of its proper divisors (6507281).

21052735 is a wasteful number, since it uses less digits than its factorization.

21052735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382793.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 21052735 is about 4588.3259474453. The cubic root of 21052735 is about 276.1231640669.

Adding to 21052735 its reverse (53725012), we get a palindrome (74777747).

The spelling of 21052735 in words is "twenty-one million, fifty-two thousand, seven hundred thirty-five".