21042031242413 has 4 divisors (see below), whose sum is σ = 21042101805888. Its totient is φ = 21041960678940.

The previous prime is 21042031242391. The next prime is 21042031242437. The reversal of 21042031242413 is 31424213024012.

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 21042031242413 - 2⁸ = 21042031242157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21042031242473) 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, 34832531 + ... + 35431472.

It is an arithmetic number, because the mean of its divisors is an integer number (5260525451472).

Almost surely, 2^{21042031242413} is an apocalyptic number.

It is an amenable number.

21042031242413 is a deficient number, since it is larger than the sum of its proper divisors (70563475).

21042031242413 is an equidigital number, since it uses as much as digits as its factorization.

21042031242413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70563474.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 21042031242413 its reverse (31424213024012), we get a palindrome (52466244266425).

The spelling of 21042031242413 in words is "twenty-one trillion, forty-two billion, thirty-one million, two hundred forty-two thousand, four hundred thirteen".