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20012122001 = 192330716763
BaseRepresentation
bin10010101000110100…
…001011111110010001
31220122200100010111202
4102220310023332101
5311441100401001
613105441120545
71305630142004
oct225064137621
956580303452
1020012122001
11853a359503
123a66029155
131b6c060311
14d7bb5d53b
157c1d6296b
hex4a8d0bf91

20012122001 has 12 divisors (see below), whose sum is σ = 21128473872. Its totient is φ = 18951988824.

The previous prime is 20012121979. The next prime is 20012122007. The reversal of 20012122001 is 10022121002.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2k-20012122001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20012122007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1185446 + ... + 1202208.

It is an arithmetic number, because the mean of its divisors is an integer number (1760706156).

Almost surely, 220012122001 is an apocalyptic number.

It is an amenable number.

20012122001 is a deficient number, since it is larger than the sum of its proper divisors (1116351871).

20012122001 is a wasteful number, since it uses less digits than its factorization.

20012122001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20108 (or 20089 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20012122001 its reverse (10022121002), we get a palindrome (30034243003).

Subtracting from 20012122001 its reverse (10022121002), we obtain a palindrome (9990000999).

The spelling of 20012122001 in words is "twenty billion, twelve million, one hundred twenty-two thousand, one".

Divisors: 1 19 361 3307 16763 62833 318497 1193827 6051443 55435241 1053269579 20012122001