13621128901 has 4 divisors (see below), whose sum is σ = 13692443904. Its totient is φ = 13549813900.

The previous prime is 13621128889. The next prime is 13621128947. The reversal of 13621128901 is 10982112631.

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 13621128901 - 2²¹ = 13619031749 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 (13621125901) 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, 35657215 + ... + 35657596.

It is an arithmetic number, because the mean of its divisors is an integer number (3423110976).

Almost surely, 2^13621128901 is an apocalyptic number.

It is an amenable number.

13621128901 is a deficient number, since it is larger than the sum of its proper divisors (71315003).

13621128901 is an equidigital number, since it uses as much as digits as its factorization.

13621128901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71315002.

The product of its (nonzero) digits is 5184, while the sum is 34.

The spelling of 13621128901 in words is "thirteen billion, six hundred twenty-one million, one hundred twenty-eight thousand, nine hundred one".