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22121121 = 3111016637
BaseRepresentation
bin101010001100…
…0101010100001
31112121212110210
41110120222201
521130333441
62110044333
7356012031
oct124305241
945555423
1022121121
1111539a20
1274a96a9
134776a29
142d1b8c1
151e1e616
hex1518aa1

22121121 has 16 divisors (see below), whose sum is σ = 32499648. Its totient is φ = 13272000.

The previous prime is 22121089. The next prime is 22121137. The reversal of 22121121 is 12112122.

It is not a de Polignac number, because 22121121 - 25 = 22121089 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22121097 and 22121106.

It is not an unprimeable number, because it can be changed into a prime (22121191) 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, 15 + ... + 6651.

It is an arithmetic number, because the mean of its divisors is an integer number (2031228).

Almost surely, 222121121 is an apocalyptic number.

It is an amenable number.

22121121 is a deficient number, since it is larger than the sum of its proper divisors (10378527).

22121121 is a wasteful number, since it uses less digits than its factorization.

22121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6752.

The product of its digits is 16, while the sum is 12.

The square root of 22121121 is about 4703.3095794345. The cubic root of 22121121 is about 280.7172131781.

Adding to 22121121 its reverse (12112122), we get a palindrome (34233243).

It can be divided in two parts, 2212 and 1121, that added together give a palindrome (3333).

The spelling of 22121121 in words is "twenty-two million, one hundred twenty-one thousand, one hundred twenty-one".

Divisors: 1 3 11 33 101 303 1111 3333 6637 19911 73007 219021 670337 2011011 7373707 22121121