21792550129 has 9 divisors (see below), whose sum is σ = 25351719627. Its totient is φ = 18678442944.

The previous prime is 21792550081. The next prime is 21792550183. The reversal of 21792550129 is 92105529712.

The square root of 21792550129 is 147623.

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., 21528812529 + 263737600 = 146727^2 + 16240^2 .

It is not a de Polignac number, because 21792550129 - 2⁷ = 21792550001 is a prime.

It is a super-2 number, since 2×21792550129² (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 (21792554129) 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, 1022817 + ... + 1043905.

Almost surely, 2^21792550129 is an apocalyptic number.

21792550129 is the 147623-rd square number.

21792550129 is the 73812-nd centered octagonal number.

It is an amenable number.

21792550129 is a deficient number, since it is larger than the sum of its proper divisors (3559169498).

21792550129 is an frugal number, since it uses more digits than its factorization.

21792550129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42192 (or 21096 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 43.

The spelling of 21792550129 in words is "twenty-one billion, seven hundred ninety-two million, five hundred fifty thousand, one hundred twenty-nine".