21012221222222 has 16 divisors (see below), whose sum is σ = 32676072507792. Its totient is φ = 10126371670080.

The previous prime is 21012221222183. The next prime is 21012221222243. The reversal of 21012221222222 is 22222212221012.

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, 1543647413 + ... + 1543661024.

It is an arithmetic number, because the mean of its divisors is an integer number (2042254531737).

Almost surely, 2^{21012221222222} is an apocalyptic number.

21012221222222 is a deficient number, since it is larger than the sum of its proper divisors (11663851285570).

21012221222222 is a wasteful number, since it uses less digits than its factorization.

21012221222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3087308563.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 21012221222222 its reverse (22222212221012), we get a palindrome (43234433443234).

The spelling of 21012221222222 in words is "twenty-one trillion, twelve billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-two".