221212111012101 has 12 divisors (see below), whose sum is σ = 348576659776800. Its totient is φ = 134067946067880.

The previous prime is 221212111012019. The next prime is 221212111012111. The reversal of 221212111012101 is 101210111212122.

It is a happy number.

221212111012101 is a `hidden beast` number, since 22 + 121 + 211 + 101 + 210 + 1 = 666.

It is not a de Polignac number, because 221212111012101 - 2¹⁷ = 221212110881029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212111012111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1117232883801 + ... + 1117232883998.

It is an arithmetic number, because the mean of its divisors is an integer number (29048054981400).

Almost surely, 2^{221212111012101} is an apocalyptic number.

It is an amenable number.

221212111012101 is a deficient number, since it is larger than the sum of its proper divisors (127364548764699).

221212111012101 is a wasteful number, since it uses less digits than its factorization.

221212111012101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2234465767816 (or 2234465767813 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 221212111012101 its reverse (101210111212122), we get a palindrome (322422222224223).

The spelling of 221212111012101 in words is "two hundred twenty-one trillion, two hundred twelve billion, one hundred eleven million, twelve thousand, one hundred one".