211221021212 has 12 divisors (see below), whose sum is σ = 375696407016. Its totient is φ = 103879190640.

The previous prime is 211221021173. The next prime is 211221021229. The reversal of 211221021212 is 212120122112.

It is a super-2 number, since 2×211221021212² (a number of 23 digits) contains 22 as substring.

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, 432829718 + ... + 432830205.

It is an arithmetic number, because the mean of its divisors is an integer number (31308033918).

Almost surely, 2^211221021212 is an apocalyptic number.

It is an amenable number.

211221021212 is a deficient number, since it is larger than the sum of its proper divisors (164475385804).

211221021212 is a wasteful number, since it uses less digits than its factorization.

211221021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865659988 (or 865659986 counting only the distinct ones).

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

Adding to 211221021212 its reverse (212120122112), we get a palindrome (423341143324).

The spelling of 211221021212 in words is "two hundred eleven billion, two hundred twenty-one million, twenty-one thousand, two hundred twelve".