Search a number
-
+
2051221311 = 32713210049
BaseRepresentation
bin111101001000011…
…0010011100111111
312021221201211122200
41322100302130333
513200103040221
6535312442543
7101555044026
oct17220623477
95257654580
102051221311
11962951a27
12492b49453
13268c6c629
141565cd8bd
15c012e426
hex7a43273f

2051221311 has 12 divisors (see below), whose sum is σ = 3004606800. Its totient is φ = 1348220160.

The previous prime is 2051221307. The next prime is 2051221331. The reversal of 2051221311 is 1131221502.

2051221311 is a `hidden beast` number, since 20 + 512 + 2 + 131 + 1 = 666.

It is not a de Polignac number, because 2051221311 - 22 = 2051221307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051221331) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1604386 + ... + 1605663.

It is an arithmetic number, because the mean of its divisors is an integer number (250383900).

Almost surely, 22051221311 is an apocalyptic number.

2051221311 is a deficient number, since it is larger than the sum of its proper divisors (953385489).

2051221311 is a wasteful number, since it uses less digits than its factorization.

2051221311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3210126 (or 3210123 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 2051221311 is about 45290.4108062623. The cubic root of 2051221311 is about 1270.5863147238.

Adding to 2051221311 its reverse (1131221502), we get a palindrome (3182442813).

The spelling of 2051221311 in words is "two billion, fifty-one million, two hundred twenty-one thousand, three hundred eleven".

Divisors: 1 3 9 71 213 639 3210049 9630147 28890441 227913479 683740437 2051221311