1211121220212 has 36 divisors (see below), whose sum is σ = 3066660769536. Its totient is φ = 403019320080.

The previous prime is 1211121220171. The next prime is 1211121220259. The reversal of 1211121220212 is 2120221211121.

1211121220212 is a `hidden beast` number, since 1 + 211 + 1 + 21 + 220 + 212 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1211121220212² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28634964 + ... + 28677227.

It is an arithmetic number, because the mean of its divisors is an integer number (85185021376).

Almost surely, 2^{1211121220212} is an apocalyptic number.

1211121220212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211121220212 is an abundant number, since it is smaller than the sum of its proper divisors (1855539549324).

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

1211121220212 is a wasteful number, since it uses less digits than its factorization.

1211121220212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57312788 (or 57312783 counting only the distinct ones).

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

Adding to 1211121220212 its reverse (2120221211121), we get a palindrome (3331342431333).

Subtracting 1211121220212 from its reverse (2120221211121), we obtain a palindrome (909099990909).

The spelling of 1211121220212 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, two hundred twenty thousand, two hundred twelve".