21236838451199 has 12 divisors (see below), whose sum is σ = 26157258405504. Its totient is φ = 17132239422144.

The previous prime is 21236838451151. The next prime is 21236838451211. The reversal of 21236838451199 is 99115483863212.

It is not a de Polignac number, because 21236838451199 - 2⁸ = 21236838450943 is a prime.

It is a super-2 number, since 2×21236838451199² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21236838451799) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12747201119 + ... + 12747202784.

It is an arithmetic number, because the mean of its divisors is an integer number (2179771533792).

Almost surely, 2^{21236838451199} is an apocalyptic number.

21236838451199 is a deficient number, since it is larger than the sum of its proper divisors (4920419954305).

21236838451199 is a wasteful number, since it uses less digits than its factorization.

21236838451199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25494403934 (or 25494403927 counting only the distinct ones).

The product of its digits is 22394880, while the sum is 62.

The spelling of 21236838451199 in words is "twenty-one trillion, two hundred thirty-six billion, eight hundred thirty-eight million, four hundred fifty-one thousand, one hundred ninety-nine".