20121107 has 2 divisors, whose sum is σ = 20121108. Its totient is φ = 20121106.

The previous prime is 20121103. The next prime is 20121121. The reversal of 20121107 is 70112102.

It is an a-pointer prime, because the next prime (20121121) can be obtained adding 20121107 to its sum of digits (14).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20121107 - 2² = 20121103 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20121091 and 20121100.

It is not a weakly prime, because it can be changed into another prime (20121103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060553 + 10060554.

It is an arithmetic number, because the mean of its divisors is an integer number (10060554).

Almost surely, 2^20121107 is an apocalyptic number.

20121107 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121107 is an equidigital number, since it uses as much as digits as its factorization.

20121107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 20121107 is about 4485.6556934299. The cubic root of 20121107 is about 271.9885510968.

Adding to 20121107 its reverse (70112102), we get a palindrome (90233209).

The spelling of 20121107 in words is "twenty million, one hundred twenty-one thousand, one hundred seven".