21101308015 has 16 divisors (see below), whose sum is σ = 25420764096. Its totient is φ = 16814995200.

The previous prime is 21101308013. The next prime is 21101308031. The reversal of 21101308015 is 51080310112.

It is not a de Polignac number, because 21101308015 - 2¹ = 21101308013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101308013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2722045 + ... + 2729785.

It is an arithmetic number, because the mean of its divisors is an integer number (1588797756).

Almost surely, 2^21101308015 is an apocalyptic number.

21101308015 is a deficient number, since it is larger than the sum of its proper divisors (4319456081).

21101308015 is a wasteful number, since it uses less digits than its factorization.

21101308015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9810.

The product of its (nonzero) digits is 240, while the sum is 22.

Adding to 21101308015 its reverse (51080310112), we get a palindrome (72181618127).

The spelling of 21101308015 in words is "twenty-one billion, one hundred one million, three hundred eight thousand, fifteen".