212122121211 has 192 divisors, whose sum is σ = 444757447680. Its totient is φ = 93756165120.

The previous prime is 212122121209. The next prime is 212122121251. The reversal of 212122121211 is 112121221212.

212122121211 is a `hidden beast` number, since 212 + 1 + 221 + 21 + 211 = 666.

It is not a de Polignac number, because 212122121211 - 2¹ = 212122121209 is a prime.

It is a super-2 number, since 2×212122121211² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212122121251) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 6316581 + ... + 6350073.

It is an arithmetic number, because the mean of its divisors is an integer number (2316445040).

Almost surely, 2^212122121211 is an apocalyptic number.

212122121211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

212122121211 is an abundant number, since it is smaller than the sum of its proper divisors (232635326469).

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

212122121211 is a wasteful number, since it uses less digits than its factorization.

212122121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33586 (or 33583 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 212122121211 its reverse (112121221212), we get a palindrome (324243342423).

It can be divided in two parts, 2121221212 and 11, that multiplied together give a palindrome (23333433332).

The spelling of 212122121211 in words is "two hundred twelve billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred eleven".