13355016421 has 4 divisors (see below), whose sum is σ = 13413335500. Its totient is φ = 13296697344.

The previous prime is 13355016391. The next prime is 13355016431. The reversal of 13355016421 is 12461055331.

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 8138565796 + 5216450625 = 90214^2 + 72225^2 .

It is a cyclic number.

It is not a de Polignac number, because 13355016421 - 2⁷ = 13355016293 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 (13355016431) 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, 29159196 + ... + 29159653.

It is an arithmetic number, because the mean of its divisors is an integer number (3353333875).

Almost surely, 2^13355016421 is an apocalyptic number.

It is an amenable number.

13355016421 is a deficient number, since it is larger than the sum of its proper divisors (58319079).

13355016421 is an equidigital number, since it uses as much as digits as its factorization.

13355016421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58319078.

The product of its (nonzero) digits is 10800, while the sum is 31.

The spelling of 13355016421 in words is "thirteen billion, three hundred fifty-five million, sixteen thousand, four hundred twenty-one".