21111121222 has 8 divisors (see below), whose sum is σ = 31671176400. Its totient is φ = 10554062424.

The previous prime is 21111121219. The next prime is 21111121231. The reversal of 21111121222 is 22212111112.

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

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21111121196 and 21111121205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 731397 + ... + 759712.

It is an arithmetic number, because the mean of its divisors is an integer number (3958897050).

Almost surely, 2^21111121222 is an apocalyptic number.

21111121222 is a deficient number, since it is larger than the sum of its proper divisors (10560055178).

21111121222 is a wasteful number, since it uses less digits than its factorization.

21111121222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498190.

The product of its digits is 32, while the sum is 16.

Adding to 21111121222 its reverse (22212111112), we get a palindrome (43323232334).

The spelling of 21111121222 in words is "twenty-one billion, one hundred eleven million, one hundred twenty-one thousand, two hundred twenty-two".