21055415233 has 8 divisors (see below), whose sum is σ = 22264736256. Its totient is φ = 19879226400.

The previous prime is 21055415207. The next prime is 21055415239. The reversal of 21055415233 is 33251455012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21055415233 - 2¹⁷ = 21055284161 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21055415195 and 21055415204.

It is not an unprimeable number, because it can be changed into a prime (21055415239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8281741 + ... + 8284282.

It is an arithmetic number, because the mean of its divisors is an integer number (2783092032).

Almost surely, 2^21055415233 is an apocalyptic number.

It is an amenable number.

21055415233 is a deficient number, since it is larger than the sum of its proper divisors (1209321023).

21055415233 is a wasteful number, since it uses less digits than its factorization.

21055415233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16566095.

The product of its (nonzero) digits is 18000, while the sum is 31.

The spelling of 21055415233 in words is "twenty-one billion, fifty-five million, four hundred fifteen thousand, two hundred thirty-three".