211221020212 has 24 divisors (see below), whose sum is σ = 370133572032. Its totient is φ = 105468643200.

The previous prime is 211221020203. The next prime is 211221020233. The reversal of 211221020212 is 212020122112.

It is a happy number.

211221020212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×211221020212² (a number of 23 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 16465633 + ... + 16478455.

It is an arithmetic number, because the mean of its divisors is an integer number (15422232168).

Almost surely, 2^211221020212 is an apocalyptic number.

It is an amenable number.

211221020212 is a deficient number, since it is larger than the sum of its proper divisors (158912551820).

211221020212 is a wasteful number, since it uses less digits than its factorization.

211221020212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18039 (or 18037 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 211221020212 its reverse (212020122112), we get a palindrome (423241142324).

The spelling of 211221020212 in words is "two hundred eleven billion, two hundred twenty-one million, twenty thousand, two hundred twelve".