21222121002 has 8 divisors (see below), whose sum is σ = 42444242016. Its totient is φ = 7074040332.

The previous prime is 21222120989. The next prime is 21222121049. The reversal of 21222121002 is 20012122212.

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

21222121002 is an admirable number.

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, 1768510078 + ... + 1768510089.

It is an arithmetic number, because the mean of its divisors is an integer number (5305530252).

Almost surely, 2^21222121002 is an apocalyptic number.

21222121002 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21222121002 is a wasteful number, since it uses less digits than its factorization.

21222121002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3537020172.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21222121002 its reverse (20012122212), we get a palindrome (41234243214).

The spelling of 21222121002 in words is "twenty-one billion, two hundred twenty-two million, one hundred twenty-one thousand, two".