13133551421 has 4 divisors (see below), whose sum is σ = 13381354332. Its totient is φ = 12885748512.

The previous prime is 13133551391. The next prime is 13133551423. The reversal of 13133551421 is 12415533131.

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 4370532100 + 8763019321 = 66110^2 + 93611^2 .

It is a cyclic number.

It is not a de Polignac number, because 13133551421 - 2²² = 13129357117 is a prime.

It is a super-2 number, since 2×13133551421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13133551423) 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, 123901376 + ... + 123901481.

It is an arithmetic number, because the mean of its divisors is an integer number (3345338583).

Almost surely, 2^13133551421 is an apocalyptic number.

It is an amenable number.

13133551421 is a deficient number, since it is larger than the sum of its proper divisors (247802911).

13133551421 is an equidigital number, since it uses as much as digits as its factorization.

13133551421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247802910.

The product of its digits is 5400, while the sum is 29.

The spelling of 13133551421 in words is "thirteen billion, one hundred thirty-three million, five hundred fifty-one thousand, four hundred twenty-one".