221211212100101 has 4 divisors (see below), whose sum is σ = 222899847307104. Its totient is φ = 219522576893100.

The previous prime is 221211212100071. The next prime is 221211212100119. The reversal of 221211212100101 is 101001212112122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221211212100101 - 2¹⁰ = 221211212099077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221211212100101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221211212150101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 844317603305 + ... + 844317603566.

It is an arithmetic number, because the mean of its divisors is an integer number (55724961826776).

Almost surely, 2^{221211212100101} is an apocalyptic number.

It is an amenable number.

221211212100101 is a deficient number, since it is larger than the sum of its proper divisors (1688635207003).

221211212100101 is a wasteful number, since it uses less digits than its factorization.

221211212100101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1688635207002.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221211212100101 its reverse (101001212112122), we get a palindrome (322212424212223).

The spelling of 221211212100101 in words is "two hundred twenty-one trillion, two hundred eleven billion, two hundred twelve million, one hundred thousand, one hundred one".