221321212301 has 16 divisors (see below), whose sum is σ = 253727104896. Its totient is φ = 189113239296.

The previous prime is 221321212249. The next prime is 221321212327. The reversal of 221321212301 is 103212123122.

It is a de Polignac number, because none of the positive numbers 2^k-221321212301 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 (221321212001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3477770 + ... + 3540836.

It is an arithmetic number, because the mean of its divisors is an integer number (15857944056).

Almost surely, 2^221321212301 is an apocalyptic number.

It is an amenable number.

221321212301 is a deficient number, since it is larger than the sum of its proper divisors (32405892595).

221321212301 is a wasteful number, since it uses less digits than its factorization.

221321212301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64628.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 221321212301 its reverse (103212123122), we get a palindrome (324533335423).

The spelling of 221321212301 in words is "two hundred twenty-one billion, three hundred twenty-one million, two hundred twelve thousand, three hundred one".