221320101021 has 4 divisors (see below), whose sum is σ = 295093468032. Its totient is φ = 147546734012.

The previous prime is 221320101019. The next prime is 221320101031. The reversal of 221320101021 is 120101023122.

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 221320101021 - 2¹ = 221320101019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221320101031) 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, 36886683501 + ... + 36886683506.

It is an arithmetic number, because the mean of its divisors is an integer number (73773367008).

Almost surely, 2^221320101021 is an apocalyptic number.

It is an amenable number.

221320101021 is a deficient number, since it is larger than the sum of its proper divisors (73773367011).

221320101021 is an equidigital number, since it uses as much as digits as its factorization.

221320101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73773367010.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 221320101021 its reverse (120101023122), we get a palindrome (341421124143).

The spelling of 221320101021 in words is "two hundred twenty-one billion, three hundred twenty million, one hundred one thousand, twenty-one".