2211121201212 has 144 divisors (see below), whose sum is σ = 7130437746432. Its totient is φ = 560960951040.

The previous prime is 2211121201087. The next prime is 2211121201217. The reversal of 2211121201212 is 2121021211122.

2211121201212 is a `hidden beast` number, since 221 + 11 + 21 + 201 + 212 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211121201217) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9155953 + ... + 9394344.

Almost surely, 2^{2211121201212} is an apocalyptic number.

2211121201212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2211121201212 is an abundant number, since it is smaller than the sum of its proper divisors (4919316545220).

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

2211121201212 is a wasteful number, since it uses less digits than its factorization.

2211121201212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18550368 (or 18550363 counting only the distinct ones).

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

Adding to 2211121201212 its reverse (2121021211122), we get a palindrome (4332142412334).

The spelling of 2211121201212 in words is "two trillion, two hundred eleven billion, one hundred twenty-one million, two hundred one thousand, two hundred twelve".