21111001222 has 8 divisors (see below), whose sum is σ = 31667126400. Its totient is φ = 10555292424.

The previous prime is 21111001193. The next prime is 21111001243. The reversal of 21111001222 is 22210011112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-4 number, since 4×21111001222⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114304 + ... + 235132.

It is an arithmetic number, because the mean of its divisors is an integer number (3958390800).

Almost surely, 2^21111001222 is an apocalyptic number.

21111001222 is a deficient number, since it is larger than the sum of its proper divisors (10556125178).

21111001222 is a wasteful number, since it uses less digits than its factorization.

21111001222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208190.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21111001222 its reverse (22210011112), we get a palindrome (43321012334).

The spelling of 21111001222 in words is "twenty-one billion, one hundred eleven million, one thousand, two hundred twenty-two".