21001231222 has 8 divisors (see below), whose sum is σ = 31502870136. Its totient is φ = 10500274512.

The previous prime is 21001231213. The next prime is 21001231241. The reversal of 21001231222 is 22213210012.

It is a happy number.

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

It is a super-2 number, since 2×21001231222² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21001231196 and 21001231205.

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, 85008 + ... + 221875.

It is an arithmetic number, because the mean of its divisors is an integer number (3937858767).

Almost surely, 2^21001231222 is an apocalyptic number.

21001231222 is a deficient number, since it is larger than the sum of its proper divisors (10501638914).

21001231222 is a wasteful number, since it uses less digits than its factorization.

21001231222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341102.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21001231222 its reverse (22213210012), we get a palindrome (43214441234).

The spelling of 21001231222 in words is "twenty-one billion, one million, two hundred thirty-one thousand, two hundred twenty-two".