221101221121 has 4 divisors (see below), whose sum is σ = 241201332144. Its totient is φ = 201001110100.

The previous prime is 221101221083. The next prime is 221101221127. The reversal of 221101221121 is 121122101122.

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 221101221121 - 2¹³ = 221101212929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221101221095 and 221101221104.

It is not an unprimeable number, because it can be changed into a prime (221101221127) 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, 10050055495 + ... + 10050055516.

It is an arithmetic number, because the mean of its divisors is an integer number (60300333036).

Almost surely, 2^221101221121 is an apocalyptic number.

It is an amenable number.

221101221121 is a deficient number, since it is larger than the sum of its proper divisors (20100111023).

221101221121 is a wasteful number, since it uses less digits than its factorization.

221101221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20100111022.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221101221121 its reverse (121122101122), we get a palindrome (342223322243).

The spelling of 221101221121 in words is "two hundred twenty-one billion, one hundred one million, two hundred twenty-one thousand, one hundred twenty-one".