2231320100021 has 4 divisors (see below), whose sum is σ = 2231366203500. Its totient is φ = 2231273996544.

The previous prime is 2231320100003. The next prime is 2231320100029. The reversal of 2231320100021 is 1200010231322.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2174117811121 + 57202288900 = 1474489^2 + 239170^2 .

It is a cyclic number.

It is not a de Polignac number, because 2231320100021 - 2¹⁴ = 2231320083637 is a prime.

It is a super-3 number, since 3×2231320100021³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2231320100029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22979066 + ... + 23075963.

It is an arithmetic number, because the mean of its divisors is an integer number (557841550875).

Almost surely, 2^{2231320100021} is an apocalyptic number.

It is an amenable number.

2231320100021 is a deficient number, since it is larger than the sum of its proper divisors (46103479).

2231320100021 is an equidigital number, since it uses as much as digits as its factorization.

2231320100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46103478.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 2231320100021 its reverse (1200010231322), we get a palindrome (3431330331343).

The spelling of 2231320100021 in words is "two trillion, two hundred thirty-one billion, three hundred twenty million, one hundred thousand, twenty-one".