22129525865209 has 9 divisors (see below), whose sum is σ = 25742547985647. Its totient is φ = 18968136802104.

The previous prime is 22129525865203. The next prime is 22129525865233. The reversal of 22129525865209 is 90256852592122.

The square root of 22129525865209 is 4704203.

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., 7597724421609 + 14531801443600 = 2756397^2 + 3812060^2 .

It is not a de Polignac number, because 22129525865209 - 2²⁷ = 22129391647481 is a prime.

It is a super-2 number, since 2×22129525865209² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22129525865203) 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, 32593407 + ... + 33265435.

Almost surely, 2^{22129525865209} is an apocalyptic number.

22129525865209 is the 4704203-rd square number.

22129525865209 is the 2352102-nd centered octagonal number.

It is an amenable number.

22129525865209 is a deficient number, since it is larger than the sum of its proper divisors (3613022120438).

22129525865209 is an frugal number, since it uses more digits than its factorization.

22129525865209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344072 (or 672036 counting only the distinct ones).

The product of its (nonzero) digits is 15552000, while the sum is 58.

The spelling of 22129525865209 in words is "twenty-two trillion, one hundred twenty-nine billion, five hundred twenty-five million, eight hundred sixty-five thousand, two hundred nine".