21236026215 has 16 divisors (see below), whose sum is σ = 34700571648. Its totient is φ = 11084904096.

The previous prime is 21236026211. The next prime is 21236026241. The reversal of 21236026215 is 51262063212.

It is not a de Polignac number, because 21236026215 - 2² = 21236026211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21236026211) 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, 15060307 + ... + 15061716.

It is an arithmetic number, because the mean of its divisors is an integer number (2168785728).

Almost surely, 2^21236026215 is an apocalyptic number.

21236026215 is a deficient number, since it is larger than the sum of its proper divisors (13464545433).

21236026215 is a wasteful number, since it uses less digits than its factorization.

21236026215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30122078.

The product of its (nonzero) digits is 8640, while the sum is 30.

Adding to 21236026215 its reverse (51262063212), we get a palindrome (72498089427).

The spelling of 21236026215 in words is "twenty-one billion, two hundred thirty-six million, twenty-six thousand, two hundred fifteen".