13552020021 has 4 divisors (see below), whose sum is σ = 18069360032. Its totient is φ = 9034680012.

The previous prime is 13552020019. The next prime is 13552020029. The reversal of 13552020021 is 12002025531.

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 not a de Polignac number, because 13552020021 - 2¹ = 13552020019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13552020021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13552020029) 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, 2258670001 + ... + 2258670006.

It is an arithmetic number, because the mean of its divisors is an integer number (4517340008).

Almost surely, 2^13552020021 is an apocalyptic number.

It is an amenable number.

13552020021 is a deficient number, since it is larger than the sum of its proper divisors (4517340011).

13552020021 is an equidigital number, since it uses as much as digits as its factorization.

13552020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4517340010.

The product of its (nonzero) digits is 600, while the sum is 21.

Adding to 13552020021 its reverse (12002025531), we get a palindrome (25554045552).

The spelling of 13552020021 in words is "thirteen billion, five hundred fifty-two million, twenty thousand, twenty-one".