21211000211222 has 4 divisors (see below), whose sum is σ = 31816500316836. Its totient is φ = 10605500105610.

The previous prime is 21211000211207. The next prime is 21211000211237. The reversal of 21211000211222 is 22211200011212.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21211000211207) and next prime (21211000211237).

It is a super-2 number, since 2×21211000211222² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21211000211222.

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 as a sum of consecutive naturals, namely, 5302750052804 + ... + 5302750052807.

It is an arithmetic number, because the mean of its divisors is an integer number (7954125079209).

Almost surely, 2^{21211000211222} is an apocalyptic number.

21211000211222 is a deficient number, since it is larger than the sum of its proper divisors (10605500105614).

21211000211222 is a wasteful number, since it uses less digits than its factorization.

21211000211222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10605500105613.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21211000211222 its reverse (22211200011212), we get a palindrome (43422200222434).

The spelling of 21211000211222 in words is "twenty-one trillion, two hundred eleven billion, two hundred eleven thousand, two hundred twenty-two".