21221222002 has 8 divisors (see below), whose sum is σ = 31867885296. Its totient is φ = 10598593572.

The previous prime is 21221221997. The next prime is 21221222023. The reversal of 21221222002 is 20022212212.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6006508 + ... + 6010039.

It is an arithmetic number, because the mean of its divisors is an integer number (3983485662).

Almost surely, 2^21221222002 is an apocalyptic number.

21221222002 is a deficient number, since it is larger than the sum of its proper divisors (10646663294).

21221222002 is a wasteful number, since it uses less digits than its factorization.

21221222002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12017432.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21221222002 its reverse (20022212212), we get a palindrome (41243434214).

The spelling of 21221222002 in words is "twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, two".