21002222222 has 4 divisors (see below), whose sum is σ = 31503333336. Its totient is φ = 10501111110.

The previous prime is 21002222183. The next prime is 21002222233. The reversal of 21002222222 is 22222220012.

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

21002222222 is a modest number, since divided by 222222 gives 21002 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 21002222222.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5250555554 + ... + 5250555557.

It is an arithmetic number, because the mean of its divisors is an integer number (7875833334).

Almost surely, 2^21002222222 is an apocalyptic number.

21002222222 is a deficient number, since it is larger than the sum of its proper divisors (10501111114).

21002222222 is a wasteful number, since it uses less digits than its factorization.

21002222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10501111113.

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 21002222222 its reverse (22222220012), we get a palindrome (43224442234).

The spelling of 21002222222 in words is "twenty-one billion, two million, two hundred twenty-two thousand, two hundred twenty-two".