221220110110212 has 72 divisors (see below), whose sum is σ = 561039378839576. Its totient is φ = 73497002793984.

The previous prime is 221220110110211. The next prime is 221220110110213. The reversal of 221220110110212 is 212011011022122.

221220110110212 is a `hidden beast` number, since 2 + 212 + 20 + 110 + 110 + 212 = 666.

It is an interprime number because it is at equal distance from previous prime (221220110110211) and next prime (221220110110213).

It can be written as a sum of positive squares in 4 ways, for example, as 33491035676736 + 187729074433476 = 5787144^2 + 13701426^2 .

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

It is not an unprimeable number, because it can be changed into a prime (221220110110211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33842838 + ... + 39846930.

Almost surely, 2^{221220110110212} is an apocalyptic number.

It is an amenable number.

221220110110212 is an abundant number, since it is smaller than the sum of its proper divisors (339819268729364).

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

221220110110212 is a wasteful number, since it uses less digits than its factorization.

221220110110212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6007477 (or 6007472 counting only the distinct ones).

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

Adding to 221220110110212 its reverse (212011011022122), we get a palindrome (433231121132334).

The spelling of 221220110110212 in words is "two hundred twenty-one trillion, two hundred twenty billion, one hundred ten million, one hundred ten thousand, two hundred twelve".