21240341315 has 8 divisors (see below), whose sum is σ = 25920416880. Its totient is φ = 16704268192.

The previous prime is 21240341261. The next prime is 21240341333. The reversal of 21240341315 is 51314304212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21240341315 - 2¹⁸ = 21240079171 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36000284 + ... + 36000873.

It is an arithmetic number, because the mean of its divisors is an integer number (3240052110).

Almost surely, 2^21240341315 is an apocalyptic number.

21240341315 is a deficient number, since it is larger than the sum of its proper divisors (4680075565).

21240341315 is an equidigital number, since it uses as much as digits as its factorization.

21240341315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72001221.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21240341315 its reverse (51314304212), we get a palindrome (72554645527).

The spelling of 21240341315 in words is "twenty-one billion, two hundred forty million, three hundred forty-one thousand, three hundred fifteen".