21112445415 has 16 divisors (see below), whose sum is σ = 33987155328. Its totient is φ = 11190890016.

The previous prime is 21112445383. The next prime is 21112445423. The reversal of 21112445415 is 51454421112.

It is not a de Polignac number, because 21112445415 - 2⁵ = 21112445383 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4315029 + ... + 4319918.

It is an arithmetic number, because the mean of its divisors is an integer number (2124197208).

Almost surely, 2^21112445415 is an apocalyptic number.

21112445415 is a deficient number, since it is larger than the sum of its proper divisors (12874709913).

21112445415 is a wasteful number, since it uses less digits than its factorization.

21112445415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8635118.

The product of its digits is 6400, while the sum is 30.

Adding to 21112445415 its reverse (51454421112), we get a palindrome (72566866527).

The spelling of 21112445415 in words is "twenty-one billion, one hundred twelve million, four hundred forty-five thousand, four hundred fifteen".