21001211222 has 8 divisors (see below), whose sum is σ = 33354864936. Its totient is φ = 9882922912.

The previous prime is 21001211111. The next prime is 21001211261. The reversal of 21001211222 is 22211210012.

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

It is a junction number, because it is equal to n+sod(n) for n = 21001211197 and 21001211206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 308841308 + ... + 308841375.

It is an arithmetic number, because the mean of its divisors is an integer number (4169358117).

Almost surely, 2^21001211222 is an apocalyptic number.

21001211222 is a deficient number, since it is larger than the sum of its proper divisors (12353653714).

21001211222 is a wasteful number, since it uses less digits than its factorization.

21001211222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617682702.

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

Adding to 21001211222 its reverse (22211210012), we get a palindrome (43212421234).

The spelling of 21001211222 in words is "twenty-one billion, one million, two hundred eleven thousand, two hundred twenty-two".