221101001212 has 72 divisors (see below), whose sum is σ = 487869280416. Its totient is φ = 85818081024.

The previous prime is 221101001203. The next prime is 221101001237. The reversal of 221101001212 is 212100101122.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 221101001192 and 221101001201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 190003 + ... + 691594.

It is an arithmetic number, because the mean of its divisors is an integer number (6775962228).

Almost surely, 2^221101001212 is an apocalyptic number.

It is an amenable number.

221101001212 is an abundant number, since it is smaller than the sum of its proper divisors (266768279204).

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

221101001212 is a wasteful number, since it uses less digits than its factorization.

221101001212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881687 (or 881672 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221101001212 its reverse (212100101122), we get a palindrome (433201102334).

The spelling of 221101001212 in words is "two hundred twenty-one billion, one hundred one million, one thousand, two hundred twelve".