21240295 has 16 divisors (see below), whose sum is σ = 26244000. Its totient is φ = 16496128.

The previous prime is 21240283. The next prime is 21240311. The reversal of 21240295 is 59204212.

It is a cyclic number.

It is not a de Polignac number, because 21240295 - 2¹³ = 21232103 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25851 + ... + 26659.

It is an arithmetic number, because the mean of its divisors is an integer number (1640250).

Almost surely, 2^21240295 is an apocalyptic number.

21240295 is a deficient number, since it is larger than the sum of its proper divisors (5003705).

21240295 is an equidigital number, since it uses as much as digits as its factorization.

21240295 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 21240295 is about 4608.7194533840. The cubic root of 21240295 is about 276.9407398417.

The spelling of 21240295 in words is "twenty-one million, two hundred forty thousand, two hundred ninety-five".