21001121222 has 8 divisors (see below), whose sum is σ = 31504116672. Its totient is φ = 10499749000.

The previous prime is 21001121189. The next prime is 21001121279. The reversal of 21001121222 is 22212110012.

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

It is a super-2 number, since 2×21001121222² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21001121197 and 21001121206.

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 3 ways as a sum of consecutive naturals, for example, 372929 + ... + 425532.

It is an arithmetic number, because the mean of its divisors is an integer number (3938014584).

Almost surely, 2^21001121222 is an apocalyptic number.

21001121222 is a deficient number, since it is larger than the sum of its proper divisors (10502995450).

21001121222 is a wasteful number, since it uses less digits than its factorization.

21001121222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811614.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21001121222 its reverse (22212110012), we get a palindrome (43213231234).

The spelling of 21001121222 in words is "twenty-one billion, one million, one hundred twenty-one thousand, two hundred twenty-two".