211212211221102 has 96 divisors (see below), whose sum is σ = 529380875566080. Its totient is φ = 54999201329280.

The previous prime is 211212211221071. The next prime is 211212211221103. The reversal of 211212211221102 is 201122112212112.

It is a super-2 number, since 2×211212211221102² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212211221103) 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, 187772049 + ... + 188893532.

It is an arithmetic number, because the mean of its divisors is an integer number (5514384120480).

Almost surely, 2^{211212211221102} is an apocalyptic number.

211212211221102 is an abundant number, since it is smaller than the sum of its proper divisors (318168664344978).

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

211212211221102 is a wasteful number, since it uses less digits than its factorization.

211212211221102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376665698 (or 376665685 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 211212211221102 its reverse (201122112212112), we get a palindrome (412334323433214).

The spelling of 211212211221102 in words is "two hundred eleven trillion, two hundred twelve billion, two hundred eleven million, two hundred twenty-one thousand, one hundred two".