221221101013 has 4 divisors (see below), whose sum is σ = 241332110208. Its totient is φ = 201110091820.

The previous prime is 221221100987. The next prime is 221221101029. The reversal of 221221101013 is 310101122122.

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 not a de Polignac number, because 221221101013 - 2⁹ = 221221100501 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 (221221101053) 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, 10055504581 + ... + 10055504602.

It is an arithmetic number, because the mean of its divisors is an integer number (60333027552).

Almost surely, 2^221221101013 is an apocalyptic number.

It is an amenable number.

221221101013 is a deficient number, since it is larger than the sum of its proper divisors (20111009195).

221221101013 is a wasteful number, since it uses less digits than its factorization.

221221101013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20111009194.

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

Adding to 221221101013 its reverse (310101122122), we get a palindrome (531322223135).

The spelling of 221221101013 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred one thousand, thirteen".