21415315499 has 8 divisors (see below), whose sum is σ = 22620229632. Its totient is φ = 20242532520.

The previous prime is 21415315489. The next prime is 21415315501. The reversal of 21415315499 is 99451351412.

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

It is not a de Polignac number, because 21415315499 - 2¹² = 21415311403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21415315469) 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 7 ways as a sum of consecutive naturals, for example, 8031419 + ... + 8034084.

It is an arithmetic number, because the mean of its divisors is an integer number (2827528704).

Almost surely, 2^21415315499 is an apocalyptic number.

21415315499 is a deficient number, since it is larger than the sum of its proper divisors (1204914133).

21415315499 is a wasteful number, since it uses less digits than its factorization.

21415315499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16065577.

The product of its digits is 194400, while the sum is 44.

The spelling of 21415315499 in words is "twenty-one billion, four hundred fifteen million, three hundred fifteen thousand, four hundred ninety-nine".