21011200022222 has 4 divisors (see below), whose sum is σ = 31516800033336. Its totient is φ = 10505600011110.

The previous prime is 21011200022173. The next prime is 21011200022297. The reversal of 21011200022222 is 22222000211012.

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 21011200022222.

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, 5252800005554 + ... + 5252800005557.

It is an arithmetic number, because the mean of its divisors is an integer number (7879200008334).

Almost surely, 2^{21011200022222} is an apocalyptic number.

21011200022222 is a deficient number, since it is larger than the sum of its proper divisors (10505600011114).

21011200022222 is a wasteful number, since it uses less digits than its factorization.

21011200022222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10505600011113.

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

Adding to 21011200022222 its reverse (22222000211012), we get a palindrome (43233200233234).

The spelling of 21011200022222 in words is "twenty-one trillion, eleven billion, two hundred million, twenty-two thousand, two hundred twenty-two".