21334144515 has 32 divisors (see below), whose sum is σ = 34866602496. Its totient is φ = 11136602880.

The previous prime is 21334144493. The next prime is 21334144519. The reversal of 21334144515 is 51544143312.

It is not a de Polignac number, because 21334144515 - 2⁵ = 21334144483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21334144519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69082 + ... + 217808.

It is an arithmetic number, because the mean of its divisors is an integer number (1089581328).

Almost surely, 2^21334144515 is an apocalyptic number.

21334144515 is a deficient number, since it is larger than the sum of its proper divisors (13532457981).

21334144515 is a wasteful number, since it uses less digits than its factorization.

21334144515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148939.

The product of its digits is 28800, while the sum is 33.

Adding to 21334144515 its reverse (51544143312), we get a palindrome (72878287827).

The spelling of 21334144515 in words is "twenty-one billion, three hundred thirty-four million, one hundred forty-four thousand, five hundred fifteen".