Search a number
-
+
1231103023221 = 31926578128829
BaseRepresentation
bin10001111010100011011…
…101010101100001110101
311100200200200112101202110
4101322203131111201311
5130132244333220341
62341321054201233
7154641611016021
oct21724335254165
94320620471673
101231103023221
1143512061a865
1217a719ab3219
138c12834b866
144382b25b381
1522055596216
hex11ea3755875

1231103023221 has 16 divisors (see below), whose sum is σ = 1728514411200. Its totient is φ = 777246018048.

The previous prime is 1231103023207. The next prime is 1231103023229. The reversal of 1231103023221 is 1223203011321.

It is not a de Polignac number, because 1231103023221 - 235 = 1196743284853 is a prime.

It is a super-3 number, since 3×12311030232213 (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231103023229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3912966 + ... + 4215863.

It is an arithmetic number, because the mean of its divisors is an integer number (108032150700).

Almost surely, 21231103023221 is an apocalyptic number.

It is an amenable number.

1231103023221 is a deficient number, since it is larger than the sum of its proper divisors (497411387979).

1231103023221 is a wasteful number, since it uses less digits than its factorization.

1231103023221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8131508.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 1231103023221 its reverse (1223203011321), we get a palindrome (2454306034542).

The spelling of 1231103023221 in words is "one trillion, two hundred thirty-one billion, one hundred three million, twenty-three thousand, two hundred twenty-one".

Divisors: 1 3 19 57 2657 7971 50483 151449 8128829 24386487 154447751 463343253 21598298653 64794895959 410367674407 1231103023221