221021101012212 has 30 divisors (see below), whose sum is σ = 577792816535858. Its totient is φ = 73673700337296.

The previous prime is 221021101012199. The next prime is 221021101012267. The reversal of 221021101012212 is 212210101120122.

221021101012212 is a `hidden beast` number, since 221 + 0 + 211 + 0 + 10 + 1 + 221 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 197770612852836 + 23250488159376 = 14063094^2 + 4821876^2 .

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 9 ways as a sum of consecutive naturals, for example, 341081945683 + ... + 341081946330.

Almost surely, 2^{221021101012212} is an apocalyptic number.

It is an amenable number.

221021101012212 is an abundant number, since it is smaller than the sum of its proper divisors (356771715523646).

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

221021101012212 is a wasteful number, since it uses less digits than its factorization.

221021101012212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682163892029 (or 682163892018 counting only the distinct ones).

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

Adding to 221021101012212 its reverse (212210101120122), we get a palindrome (433231202132334).

The spelling of 221021101012212 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred one million, twelve thousand, two hundred twelve".