21002012111222 has 16 divisors (see below), whose sum is σ = 32158290380544. Its totient is φ = 10284540945000.

The previous prime is 21002012111203. The next prime is 21002012111231. The reversal of 21002012111222 is 22211121020012.

It is a self number, because there is not a number n which added to its sum of digits gives 21002012111222.

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, 489718604 + ... + 489761487.

It is an arithmetic number, because the mean of its divisors is an integer number (2009893148784).

Almost surely, 2^{21002012111222} is an apocalyptic number.

21002012111222 is a deficient number, since it is larger than the sum of its proper divisors (11156278269322).

21002012111222 is a wasteful number, since it uses less digits than its factorization.

21002012111222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979480315.

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

Adding to 21002012111222 its reverse (22211121020012), we get a palindrome (43213133131234).

The spelling of 21002012111222 in words is "twenty-one trillion, two billion, twelve million, one hundred eleven thousand, two hundred twenty-two".