21123133443013 has 4 divisors (see below), whose sum is σ = 24140723934880. Its totient is φ = 18105542951148.

The previous prime is 21123133443007. The next prime is 21123133443017. The reversal of 21123133443013 is 31034433132112.

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 21123133443013 - 2²¹ = 21123131345861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123133443017) 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, 1508795245923 + ... + 1508795245936.

It is an arithmetic number, because the mean of its divisors is an integer number (6035180983720).

Almost surely, 2^{21123133443013} is an apocalyptic number.

It is an amenable number.

21123133443013 is a deficient number, since it is larger than the sum of its proper divisors (3017590491867).

21123133443013 is an equidigital number, since it uses as much as digits as its factorization.

21123133443013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3017590491866.

The product of its (nonzero) digits is 15552, while the sum is 31.

Adding to 21123133443013 its reverse (31034433132112), we get a palindrome (52157566575125).

The spelling of 21123133443013 in words is "twenty-one trillion, one hundred twenty-three billion, one hundred thirty-three million, four hundred forty-three thousand, thirteen".