21314451515 has 8 divisors (see below), whose sum is σ = 29231247840. Its totient is φ = 14615623872.

The previous prime is 21314451497. The next prime is 21314451527. The reversal of 21314451515 is 51515441312.

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 21314451515 - 2¹² = 21314447419 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 304492130 + ... + 304492199.

It is an arithmetic number, because the mean of its divisors is an integer number (3653905980).

Almost surely, 2^21314451515 is an apocalyptic number.

21314451515 is a deficient number, since it is larger than the sum of its proper divisors (7916796325).

21314451515 is an equidigital number, since it uses as much as digits as its factorization.

21314451515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608984341.

The product of its digits is 12000, while the sum is 32.

Adding to 21314451515 its reverse (51515441312), we get a palindrome (72829892827).

The spelling of 21314451515 in words is "twenty-one billion, three hundred fourteen million, four hundred fifty-one thousand, five hundred fifteen".