21290603569 has 9 divisors (see below), whose sum is σ = 21575197497. Its totient is φ = 21009721044.

The previous prime is 21290603563. The next prime is 21290603597. The reversal of 21290603569 is 96530609212.

The square root of 21290603569 is 145913.

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

It is not a de Polignac number, because 21290603569 - 2¹⁵ = 21290570801 is a prime.

It is a super-2 number, since 2×21290603569² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21290603563) 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, 11526204 + ... + 11528050.

Almost surely, 2^21290603569 is an apocalyptic number.

21290603569 is the 145913-rd square number.

21290603569 is the 72957-th centered octagonal number.

It is an amenable number.

21290603569 is a deficient number, since it is larger than the sum of its proper divisors (284593928).

21290603569 is an frugal number, since it uses more digits than its factorization.

21290603569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3852 (or 1926 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 43.

The spelling of 21290603569 in words is "twenty-one billion, two hundred ninety million, six hundred three thousand, five hundred sixty-nine".