21228480015 has 16 divisors (see below), whose sum is σ = 34266151008. Its totient is φ = 11221661696.

The previous prime is 21228479981. The next prime is 21228480019. The reversal of 21228480015 is 51008482212.

It is a cyclic number.

It is not a de Polignac number, because 21228480015 - 2¹⁰ = 21228478991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21228480019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6260394 + ... + 6263783.

It is an arithmetic number, because the mean of its divisors is an integer number (2141634438).

Almost surely, 2^21228480015 is an apocalyptic number.

21228480015 is a deficient number, since it is larger than the sum of its proper divisors (13037670993).

21228480015 is a wasteful number, since it uses less digits than its factorization.

21228480015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12524298.

The product of its (nonzero) digits is 10240, while the sum is 33.

The spelling of 21228480015 in words is "twenty-one billion, two hundred twenty-eight million, four hundred eighty thousand, fifteen".