13123410220421 has 4 divisors (see below), whose sum is σ = 13124576653344. Its totient is φ = 13122243787500.

The previous prime is 13123410220399. The next prime is 13123410220471. The reversal of 13123410220421 is 12402201432131.

It is a happy number.

13123410220421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 13123410220421 - 2³⁴ = 13106230351237 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 (13123410220471) 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, 583199585 + ... + 583222086.

It is an arithmetic number, because the mean of its divisors is an integer number (3281144163336).

Almost surely, 2^{13123410220421} is an apocalyptic number.

It is an amenable number.

13123410220421 is a deficient number, since it is larger than the sum of its proper divisors (1166432923).

13123410220421 is a wasteful number, since it uses less digits than its factorization.

13123410220421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166432922.

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 13123410220421 its reverse (12402201432131), we get a palindrome (25525611652552).

The spelling of 13123410220421 in words is "thirteen trillion, one hundred twenty-three billion, four hundred ten million, two hundred twenty thousand, four hundred twenty-one".