21236606337 has 16 divisors (see below), whose sum is σ = 29844584000. Its totient is φ = 13395124224.

The previous prime is 21236606311. The next prime is 21236606407. The reversal of 21236606337 is 73360663212.

It is a happy number.

It is not a de Polignac number, because 21236606337 - 2²⁴ = 21219829121 is a prime.

It is a super-3 number, since 3×21236606337³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21236606295 and 21236606304.

It is not an unprimeable number, because it can be changed into a prime (21236605337) 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, 198412 + ... + 286077.

It is an arithmetic number, because the mean of its divisors is an integer number (1865286500).

Almost surely, 2^21236606337 is an apocalyptic number.

It is an amenable number.

21236606337 is a deficient number, since it is larger than the sum of its proper divisors (8607977663).

21236606337 is a wasteful number, since it uses less digits than its factorization.

21236606337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485280.

The product of its (nonzero) digits is 163296, while the sum is 39.

The spelling of 21236606337 in words is "twenty-one billion, two hundred thirty-six million, six hundred six thousand, three hundred thirty-seven".