21111002111222 has 4 divisors (see below), whose sum is σ = 31666503166836. Its totient is φ = 10555501055610.

The previous prime is 21111002111209. The next prime is 21111002111261. The reversal of 21111002111222 is 22211120011112.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21111002111222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5277750527804 + ... + 5277750527807.

It is an arithmetic number, because the mean of its divisors is an integer number (7916625791709).

Almost surely, 2^{21111002111222} is an apocalyptic number.

21111002111222 is a deficient number, since it is larger than the sum of its proper divisors (10555501055614).

21111002111222 is a wasteful number, since it uses less digits than its factorization.

21111002111222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10555501055613.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21111002111222 its reverse (22211120011112), we get a palindrome (43322122122334).

The spelling of 21111002111222 in words is "twenty-one trillion, one hundred eleven billion, two million, one hundred eleven thousand, two hundred twenty-two".