21111201222 has 128 divisors (see below), whose sum is σ = 48379659264. Its totient is φ = 6103646208.

The previous prime is 21111201217. The next prime is 21111201277. The reversal of 21111201222 is 22210211112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9286678 + ... + 9288950.

It is an arithmetic number, because the mean of its divisors is an integer number (377966088).

Almost surely, 2^21111201222 is an apocalyptic number.

21111201222 is an abundant number, since it is smaller than the sum of its proper divisors (27268458042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111201222 is a wasteful number, since it uses less digits than its factorization.

21111201222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2462.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21111201222 its reverse (22210211112), we get a palindrome (43321412334).

The spelling of 21111201222 in words is "twenty-one billion, one hundred eleven million, two hundred one thousand, two hundred twenty-two".