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22020121 = 101218021
BaseRepresentation
bin101010000000…
…0000000011001
31112102201221001
41110000000121
521114120441
62103545001
7355111414
oct124000031
945381831
1022020121
1111480052
12745b161
13473ca76
142cd2b7b
151dee731
hex1500019

22020121 has 4 divisors (see below), whose sum is σ = 22238244. Its totient is φ = 21802000.

The previous prime is 22020091. The next prime is 22020127. The reversal of 22020121 is 12102022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15492096 + 6528025 = 3936^2 + 2555^2 .

It is a cyclic number.

It is not a de Polignac number, because 22020121 - 29 = 22019609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22020098 and 22020107.

It is not an unprimeable number, because it can be changed into a prime (22020127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108910 + ... + 109111.

It is an arithmetic number, because the mean of its divisors is an integer number (5559561).

Almost surely, 222020121 is an apocalyptic number.

It is an amenable number.

22020121 is a deficient number, since it is larger than the sum of its proper divisors (218123).

22020121 is a wasteful number, since it uses less digits than its factorization.

22020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218122.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 22020121 is about 4692.5601754266. The cubic root of 22020121 is about 280.2893310261.

Adding to 22020121 its reverse (12102022), we get a palindrome (34122143).

The spelling of 22020121 in words is "twenty-two million, twenty thousand, one hundred twenty-one".

Divisors: 1 101 218021 22020121