21120441430313 has 4 divisors (see below), whose sum is σ = 21126725409108. Its totient is φ = 21114157451520.

The previous prime is 21120441430307. The next prime is 21120441430321. The reversal of 21120441430313 is 31303414402112.

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 16669974420544 + 4450467009769 = 4082888^2 + 2109613^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120441430313 - 2⁸ = 21120441430057 is a prime.

It is a super-2 number, since 2×21120441430313² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120441436313) 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, 3141984356 + ... + 3141991077.

It is an arithmetic number, because the mean of its divisors is an integer number (5281681352277).

Almost surely, 2^{21120441430313} is an apocalyptic number.

It is an amenable number.

21120441430313 is a deficient number, since it is larger than the sum of its proper divisors (6283978795).

21120441430313 is an equidigital number, since it uses as much as digits as its factorization.

21120441430313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6283978794.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 21120441430313 its reverse (31303414402112), we get a palindrome (52423855832425).

The spelling of 21120441430313 in words is "twenty-one trillion, one hundred twenty billion, four hundred forty-one million, four hundred thirty thousand, three hundred thirteen".