21000211222 has 4 divisors (see below), whose sum is σ = 31500316836. Its totient is φ = 10500105610.

The previous prime is 21000211207. The next prime is 21000211223. The reversal of 21000211222 is 22211200012.

It is a happy number.

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

It is a super-2 number, since 2×21000211222² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000211223) by changing a digit.

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 as a sum of consecutive naturals, namely, 5250052804 + ... + 5250052807.

It is an arithmetic number, because the mean of its divisors is an integer number (7875079209).

Almost surely, 2^21000211222 is an apocalyptic number.

21000211222 is a deficient number, since it is larger than the sum of its proper divisors (10500105614).

21000211222 is a wasteful number, since it uses less digits than its factorization.

21000211222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10500105613.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21000211222 its reverse (22211200012), we get a palindrome (43211411234).

The spelling of 21000211222 in words is "twenty-one billion, two hundred eleven thousand, two hundred twenty-two".