221121012101 has 12 divisors (see below), whose sum is σ = 243095794956. Its totient is φ = 200981531520.

The previous prime is 221121012059. The next prime is 221121012107. The reversal of 221121012101 is 101210121122.

It can be written as a sum of positive squares in 2 ways, for example, as 78890203876 + 142230808225 = 280874^2 + 377135^2 .

It is not a de Polignac number, because 221121012101 - 2¹⁸ = 221120749957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121012107) 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, 489821 + ... + 825933.

It is an arithmetic number, because the mean of its divisors is an integer number (20257982913).

Almost surely, 2^221121012101 is an apocalyptic number.

It is an amenable number.

221121012101 is a deficient number, since it is larger than the sum of its proper divisors (21974782855).

221121012101 is a wasteful number, since it uses less digits than its factorization.

221121012101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341572 (or 341561 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 221121012101 its reverse (101210121122), we get a palindrome (322331133223).

The spelling of 221121012101 in words is "two hundred twenty-one billion, one hundred twenty-one million, twelve thousand, one hundred one".