211222121012 has 24 divisors (see below), whose sum is σ = 426545648256. Its totient is φ = 89644893408.

The previous prime is 211222120933. The next prime is 211222121039. The reversal of 211222121012 is 210121222112.

It is a super-2 number, since 2×211222121012² (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 7 ways as a sum of consecutive naturals, for example, 36616763 + ... + 36622530.

It is an arithmetic number, because the mean of its divisors is an integer number (17772735344).

Almost surely, 2^211222121012 is an apocalyptic number.

It is an amenable number.

211222121012 is an abundant number, since it is smaller than the sum of its proper divisors (215323527244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211222121012 is a wasteful number, since it uses less digits than its factorization.

211222121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73239407 (or 73239405 counting only the distinct ones).

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

Adding to 211222121012 its reverse (210121222112), we get a palindrome (421343343124).

The spelling of 211222121012 in words is "two hundred eleven billion, two hundred twenty-two million, one hundred twenty-one thousand, twelve".