2143913852521 has 9 divisors (see below), whose sum is σ = 2493952526871. Its totient is φ = 1837631659752.

The previous prime is 2143913852519. The next prime is 2143913852567. The reversal of 2143913852521 is 1252583193412.

The square root of 2143913852521 is 1464211.

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

It can be written as a sum of positive squares in only one way, i.e., 2130651105625 + 13262746896 = 1459675^2 + 115164^2 .

It is not a de Polignac number, because 2143913852521 - 2¹ = 2143913852519 is a prime.

It is a super-2 number, since 2×2143913852521² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2143913852581) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10144891 + ... + 10354063.

It is an arithmetic number, because the mean of its divisors is an integer number (277105836319).

Almost surely, 2^{2143913852521} is an apocalyptic number.

2143913852521 is the 1464211-st square number.

2143913852521 is the 732106-th centered octagonal number.

It is an amenable number.

2143913852521 is a deficient number, since it is larger than the sum of its proper divisors (350038674350).

2143913852521 is an frugal number, since it uses more digits than its factorization.

2143913852521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418360 (or 209180 counting only the distinct ones).

The product of its digits is 518400, while the sum is 46.

The spelling of 2143913852521 in words is "two trillion, one hundred forty-three billion, nine hundred thirteen million, eight hundred fifty-two thousand, five hundred twenty-one".