21022256366 has 8 divisors (see below), whose sum is σ = 31535310744. Its totient is φ = 10510486120.

The previous prime is 21022256363. The next prime is 21022256443. The reversal of 21022256366 is 66365222012.

21022256366 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022256363) 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 3 ways as a sum of consecutive naturals, for example, 279005 + ... + 346248.

It is an arithmetic number, because the mean of its divisors is an integer number (3941913843).

Almost surely, 2^21022256366 is an apocalyptic number.

21022256366 is a deficient number, since it is larger than the sum of its proper divisors (10513054378).

21022256366 is a wasteful number, since it uses less digits than its factorization.

21022256366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642066.

The product of its (nonzero) digits is 51840, while the sum is 35.

Adding to 21022256366 its reverse (66365222012), we get a palindrome (87387478378).

The spelling of 21022256366 in words is "twenty-one billion, twenty-two million, two hundred fifty-six thousand, three hundred sixty-six".