221312320111021 has 8 divisors (see below), whose sum is σ = 221694404641400. Its totient is φ = 220930432588800.

The previous prime is 221312320111009. The next prime is 221312320111037. The reversal of 221312320111021 is 120111023213122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6895193256900 + 214417126854121 = 2625870^2 + 14642989^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221312320111021 - 2⁵ = 221312320110989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221312320110983 and 221312320111001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221312320111061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47003280 + ... + 51496921.

It is an arithmetic number, because the mean of its divisors is an integer number (27711800580175).

Almost surely, 2^{221312320111021} is an apocalyptic number.

It is an amenable number.

221312320111021 is a deficient number, since it is larger than the sum of its proper divisors (382084530379).

221312320111021 is an equidigital number, since it uses as much as digits as its factorization.

221312320111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98504079.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 221312320111021 its reverse (120111023213122), we get a palindrome (341423343324143).

The spelling of 221312320111021 in words is "two hundred twenty-one trillion, three hundred twelve billion, three hundred twenty million, one hundred eleven thousand, twenty-one".