21222111021002 has 24 divisors (see below), whose sum is σ = 33280149947940. Its totient is φ = 10148864506880.

The previous prime is 21222111020977. The next prime is 21222111021037. The reversal of 21222111021002 is 20012011122212.

It can be written as a sum of positive squares in 2 ways, for example, as 20917990757161 + 304120263841 = 4573619^2 + 551471^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12041624 + ... + 13691052.

Almost surely, 2^{21222111021002} is an apocalyptic number.

21222111021002 is a deficient number, since it is larger than the sum of its proper divisors (12058038926938).

21222111021002 is a wasteful number, since it uses less digits than its factorization.

21222111021002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1661638 (or 1661615 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21222111021002 its reverse (20012011122212), we get a palindrome (41234122143214).

The spelling of 21222111021002 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred eleven million, twenty-one thousand, two".