21034753 has 4 divisors (see below), whose sum is σ = 21174208. Its totient is φ = 20895300.

The previous prime is 21034751. The next prime is 21034757. The reversal of 21034753 is 35743012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21034753 - 2¹ = 21034751 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21034751) 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, 69501 + ... + 69802.

It is an arithmetic number, because the mean of its divisors is an integer number (5293552).

Almost surely, 2^21034753 is an apocalyptic number.

It is an amenable number.

21034753 is a deficient number, since it is larger than the sum of its proper divisors (139455).

21034753 is a wasteful number, since it uses less digits than its factorization.

21034753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139454.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 21034753 is about 4586.3659906292. The cubic root of 21034753 is about 276.0445256528.

Adding to 21034753 its reverse (35743012), we get a palindrome (56777765).

The spelling of 21034753 in words is "twenty-one million, thirty-four thousand, seven hundred fifty-three".