21123103232313 has 24 divisors (see below), whose sum is σ = 31220982400608. Its totient is φ = 13754459158272.

The previous prime is 21123103232303. The next prime is 21123103232321. The reversal of 21123103232313 is 31323230132112.

21123103232313 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 310 + 3 + 2 + 32 + 313 = 666.

It is not a de Polignac number, because 21123103232313 - 2⁵ = 21123103232281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21123103232303) 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 23 ways as a sum of consecutive naturals, for example, 75273481 + ... + 75553577.

It is an arithmetic number, because the mean of its divisors is an integer number (1300874266692).

Almost surely, 2^{21123103232313} is an apocalyptic number.

It is an amenable number.

21123103232313 is a deficient number, since it is larger than the sum of its proper divisors (10097879168295).

21123103232313 is a wasteful number, since it uses less digits than its factorization.

21123103232313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475013 (or 475010 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

Adding to 21123103232313 its reverse (31323230132112), we get a palindrome (52446333364425).

The spelling of 21123103232313 in words is "twenty-one trillion, one hundred twenty-three billion, one hundred three million, two hundred thirty-two thousand, three hundred thirteen".