21785222222 has 4 divisors (see below), whose sum is σ = 32677833336. Its totient is φ = 10892611110.

The previous prime is 21785222219. The next prime is 21785222279. The reversal of 21785222222 is 22222258712.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5446305554 + ... + 5446305557.

It is an arithmetic number, because the mean of its divisors is an integer number (8169458334).

Almost surely, 2^21785222222 is an apocalyptic number.

21785222222 is a deficient number, since it is larger than the sum of its proper divisors (10892611114).

21785222222 is a wasteful number, since it uses less digits than its factorization.

21785222222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10892611113.

The product of its digits is 35840, while the sum is 35.

The spelling of 21785222222 in words is "twenty-one billion, seven hundred eighty-five million, two hundred twenty-two thousand, two hundred twenty-two".