13147144921 has 3 divisors (see below), whose sum is σ = 13147259583. Its totient is φ = 13147030260.

The previous prime is 13147144903. The next prime is 13147144937. The reversal of 13147144921 is 12944174131.

The square root of 13147144921 is 114661.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 5272357321 + 7874787600 = 72611^2 + 88740^2 .

It is not a de Polignac number, because 13147144921 - 2¹³ = 13147136729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13147144121) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 57331 + ... + 171991.

It is an arithmetic number, because the mean of its divisors is an integer number (4382419861).

Almost surely, 2^13147144921 is an apocalyptic number.

13147144921 is the 114661-st square number.

13147144921 is the 57331-st centered octagonal number.

It is an amenable number.

13147144921 is a deficient number, since it is larger than the sum of its proper divisors (114662).

13147144921 is an frugal number, since it uses more digits than its factorization.

13147144921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229322 (or 114661 counting only the distinct ones).

The product of its digits is 24192, while the sum is 37.

The spelling of 13147144921 in words is "thirteen billion, one hundred forty-seven million, one hundred forty-four thousand, nine hundred twenty-one".