21211022318 has 4 divisors (see below), whose sum is σ = 31816533480. Its totient is φ = 10605511158.

The previous prime is 21211022317. The next prime is 21211022323. The reversal of 21211022318 is 81322011212.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21211022293 and 21211022302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211022311) 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 as a sum of consecutive naturals, namely, 5302755578 + ... + 5302755581.

It is an arithmetic number, because the mean of its divisors is an integer number (7954133370).

Almost surely, 2^21211022318 is an apocalyptic number.

21211022318 is a deficient number, since it is larger than the sum of its proper divisors (10605511162).

21211022318 is a wasteful number, since it uses less digits than its factorization.

21211022318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10605511161.

The product of its (nonzero) digits is 384, while the sum is 23.

The spelling of 21211022318 in words is "twenty-one billion, two hundred eleven million, twenty-two thousand, three hundred eighteen".