221210103121 has 4 divisors (see below), whose sum is σ = 252811546432. Its totient is φ = 189608659812.

The previous prime is 221210103067. The next prime is 221210103131. The reversal of 221210103121 is 121301012122.

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 221210103121 - 2¹⁵ = 221210070353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221210103095 and 221210103104.

It is not an unprimeable number, because it can be changed into a prime (221210103131) 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, 15800721645 + ... + 15800721658.

It is an arithmetic number, because the mean of its divisors is an integer number (63202886608).

Almost surely, 2^221210103121 is an apocalyptic number.

It is an amenable number.

221210103121 is a deficient number, since it is larger than the sum of its proper divisors (31601443311).

221210103121 is an equidigital number, since it uses as much as digits as its factorization.

221210103121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31601443310.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 221210103121 its reverse (121301012122), we get a palindrome (342511115243).

Subtracting from 221210103121 its reverse (121301012122), we obtain a palindrome (99909090999).

The spelling of 221210103121 in words is "two hundred twenty-one billion, two hundred ten million, one hundred three thousand, one hundred twenty-one".