21534735 has 16 divisors (see below), whose sum is σ = 34515936. Its totient is φ = 11465088.

The previous prime is 21534731. The next prime is 21534743. The reversal of 21534735 is 53743512.

It is not a de Polignac number, because 21534735 - 2² = 21534731 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21534731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12337 + ... + 13973.

It is an arithmetic number, because the mean of its divisors is an integer number (2157246).

Almost surely, 2^21534735 is an apocalyptic number.

21534735 is a deficient number, since it is larger than the sum of its proper divisors (12981201).

21534735 is a wasteful number, since it uses less digits than its factorization.

21534735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2522.

The product of its digits is 12600, while the sum is 30.

The square root of 21534735 is about 4640.5533075270. The cubic root of 21534735 is about 278.2145532431.

The spelling of 21534735 in words is "twenty-one million, five hundred thirty-four thousand, seven hundred thirty-five".