21002102221222 has 16 divisors (see below), whose sum is σ = 32059154281680. Its totient is φ = 10315962451872.

The previous prime is 21002102221211. The next prime is 21002102221231. The reversal of 21002102221222 is 22212220120012.

It is a self number, because there is not a number n which added to its sum of digits gives 21002102221222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61075593 + ... + 61418500.

It is an arithmetic number, because the mean of its divisors is an integer number (2003697142605).

Almost surely, 2^{21002102221222} is an apocalyptic number.

21002102221222 is a deficient number, since it is larger than the sum of its proper divisors (11057052060458).

21002102221222 is a wasteful number, since it uses less digits than its factorization.

21002102221222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122495607.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21002102221222 its reverse (22212220120012), we get a palindrome (43214322341234).

The spelling of 21002102221222 in words is "twenty-one trillion, two billion, one hundred two million, two hundred twenty-one thousand, two hundred twenty-two".