21234332515 has 16 divisors (see below), whose sum is σ = 27800762976. Its totient is φ = 15441433600.

The previous prime is 21234332513. The next prime is 21234332543. The reversal of 21234332515 is 51523343212.

It is not a de Polignac number, because 21234332515 - 2¹ = 21234332513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21234332513) 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, 690099 + ... + 720211.

It is an arithmetic number, because the mean of its divisors is an integer number (1737547686).

Almost surely, 2^21234332515 is an apocalyptic number.

21234332515 is a deficient number, since it is larger than the sum of its proper divisors (6566430461).

21234332515 is a wasteful number, since it uses less digits than its factorization.

21234332515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42950.

The product of its digits is 21600, while the sum is 31.

Adding to 21234332515 its reverse (51523343212), we get a palindrome (72757675727).

The spelling of 21234332515 in words is "twenty-one billion, two hundred thirty-four million, three hundred thirty-two thousand, five hundred fifteen".