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20012122111 is a prime number
BaseRepresentation
bin10010101000110100…
…001011111111111111
31220122200100010122211
4102220310023333333
5311441100401421
613105441121251
71305630142222
oct225064137777
956580303584
1020012122111
11853a3595a3
123a66029227
131b6c060397
14d7bb5d5b9
157c1d629e1
hex4a8d0bfff

20012122111 has 2 divisors, whose sum is σ = 20012122112. Its totient is φ = 20012122110.

The previous prime is 20012122103. The next prime is 20012122129. The reversal of 20012122111 is 11122121002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20012122111 - 23 = 20012122103 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20012122091 and 20012122100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20012122411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006061055 + 10006061056.

It is an arithmetic number, because the mean of its divisors is an integer number (10006061056).

Almost surely, 220012122111 is an apocalyptic number.

20012122111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012122111 is an equidigital number, since it uses as much as digits as its factorization.

20012122111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20012122111 its reverse (11122121002), we get a palindrome (31134243113).

The spelling of 20012122111 in words is "twenty billion, twelve million, one hundred twenty-two thousand, one hundred eleven".