21592871056969 has 9 divisors (see below), whose sum is σ = 21713673568629. Its totient is φ = 21472737000480.

The previous prime is 21592871056891. The next prime is 21592871056993. The reversal of 21592871056969 is 96965017829512.

The square root of 21592871056969 is 4646813.

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

It can be written as a sum of positive squares in 4 ways, for example, as 1848960855225 + 19743910201744 = 1359765^2 + 4443412^2 .

It is not a de Polignac number, because 21592871056969 - 2²³ = 21592862668361 is a prime.

It is a super-2 number, since 2×21592871056969² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21592871056898 and 21592871056907.

It is not an unprimeable number, because it can be changed into a prime (21592871056369) 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, 841060317 + ... + 841085989.

Almost surely, 2^{21592871056969} is an apocalyptic number.

21592871056969 is the 4646813-rd square number.

21592871056969 is the 2323407-th centered octagonal number.

It is an amenable number.

21592871056969 is a deficient number, since it is larger than the sum of its proper divisors (120802511660).

21592871056969 is an frugal number, since it uses more digits than its factorization.

21592871056969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51708 (or 25854 counting only the distinct ones).

The product of its (nonzero) digits is 146966400, while the sum is 70.

The spelling of 21592871056969 in words is "twenty-one trillion, five hundred ninety-two billion, eight hundred seventy-one million, fifty-six thousand, nine hundred sixty-nine".