21387856222 has 8 divisors (see below), whose sum is σ = 32120863272. Its totient is φ = 10680901800.

The previous prime is 21387856201. The next prime is 21387856229. The reversal of 21387856222 is 22265878312.

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

It is a super-2 number, since 2×21387856222² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21387856229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6511104 + ... + 6514387.

It is an arithmetic number, because the mean of its divisors is an integer number (4015107909).

Almost surely, 2^21387856222 is an apocalyptic number.

21387856222 is a deficient number, since it is larger than the sum of its proper divisors (10733007050).

21387856222 is a wasteful number, since it uses less digits than its factorization.

21387856222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13026314.

The product of its digits is 645120, while the sum is 46.

The spelling of 21387856222 in words is "twenty-one billion, three hundred eighty-seven million, eight hundred fifty-six thousand, two hundred twenty-two".