221001122101 has 4 divisors (see below), whose sum is σ = 221423686912. Its totient is φ = 220578557292.

The previous prime is 221001122081. The next prime is 221001122117. The reversal of 221001122101 is 101221100122.

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, and also an emirpimes, since its reverse is a distinct semiprime: 101221100122 = 2 ⋅50610550061.

It is a cyclic number.

It is not a de Polignac number, because 221001122101 - 2³³ = 212411187509 is a prime.

It is a super-2 number, since 2×221001122101² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001122191) 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, 211281621 + ... + 211282666.

It is an arithmetic number, because the mean of its divisors is an integer number (55355921728).

Almost surely, 2^221001122101 is an apocalyptic number.

It is an amenable number.

221001122101 is a deficient number, since it is larger than the sum of its proper divisors (422564811).

221001122101 is an equidigital number, since it uses as much as digits as its factorization.

221001122101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422564810.

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

Adding to 221001122101 its reverse (101221100122), we get a palindrome (322222222223).

The spelling of 221001122101 in words is "two hundred twenty-one billion, one million, one hundred twenty-two thousand, one hundred one".