2101212111222 has 160 divisors (see below), whose sum is σ = 5643348682752. Its totient is φ = 571327960896.

The previous prime is 2101212111211. The next prime is 2101212111239. The reversal of 2101212111222 is 2221112121012.

2101212111222 is a `hidden beast` number, since 210 + 1 + 21 + 211 + 1 + 222 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 2101212111195 and 2101212111204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 4933683 + ... + 5342625.

Almost surely, 2^{2101212111222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2101212111222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2821674341376).

2101212111222 is an abundant number, since it is smaller than the sum of its proper divisors (3542136571530).

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

2101212111222 is a wasteful number, since it uses less digits than its factorization.

2101212111222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409184 (or 409175 counting only the distinct ones).

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

Adding to 2101212111222 its reverse (2221112121012), we get a palindrome (4322324232234).

The spelling of 2101212111222 in words is "two trillion, one hundred one billion, two hundred twelve million, one hundred eleven thousand, two hundred twenty-two".