21222002 has 8 divisors (see below), whose sum is σ = 31899312. Its totient is φ = 10588900.

The previous prime is 21221953. The next prime is 21222013. The reversal of 21222002 is 20022212.

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, 9824 + ... + 11787.

It is an arithmetic number, because the mean of its divisors is an integer number (3987414).

Almost surely, 2^21222002 is an apocalyptic number.

21222002 is a deficient number, since it is larger than the sum of its proper divisors (10677310).

21222002 is a wasteful number, since it uses less digits than its factorization.

21222002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22104.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 21222002 is about 4606.7344182186. The cubic root of 21222002 is about 276.8612128228.

Adding to 21222002 its reverse (20022212), we get a palindrome (41244214).

The spelling of 21222002 in words is "twenty-one million, two hundred twenty-two thousand, two".