221234204021 has 4 divisors (see below), whose sum is σ = 221328308544. Its totient is φ = 221140099500.

The previous prime is 221234204017. The next prime is 221234204119. The reversal of 221234204021 is 120402432122.

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 221234204021 - 2² = 221234204017 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 (221234204221) 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, 47048735 + ... + 47053436.

It is an arithmetic number, because the mean of its divisors is an integer number (55332077136).

Almost surely, 2^221234204021 is an apocalyptic number.

It is an amenable number.

221234204021 is a deficient number, since it is larger than the sum of its proper divisors (94104523).

221234204021 is an equidigital number, since it uses as much as digits as its factorization.

221234204021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94104522.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 221234204021 its reverse (120402432122), we get a palindrome (341636636143).

The spelling of 221234204021 in words is "two hundred twenty-one billion, two hundred thirty-four million, two hundred four thousand, twenty-one".