21110002220222 has 4 divisors (see below), whose sum is σ = 31665003330336. Its totient is φ = 10555001110110.

The previous prime is 21110002220179. The next prime is 21110002220249. The reversal of 21110002220222 is 22202220001112.

It is a happy number.

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 21110002220222.

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, 5277500555054 + ... + 5277500555057.

It is an arithmetic number, because the mean of its divisors is an integer number (7916250832584).

Almost surely, 2^{21110002220222} is an apocalyptic number.

21110002220222 is a deficient number, since it is larger than the sum of its proper divisors (10555001110114).

21110002220222 is a wasteful number, since it uses less digits than its factorization.

21110002220222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10555001110113.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21110002220222 its reverse (22202220001112), we get a palindrome (43312222221334).

The spelling of 21110002220222 in words is "twenty-one trillion, one hundred ten billion, two million, two hundred twenty thousand, two hundred twenty-two".