20012121007 has 2 divisors, whose sum is σ = 20012121008. Its totient is φ = 20012121006.

The previous prime is 20012121001. The next prime is 20012121043. The reversal of 20012121007 is 70012121002.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20012121007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20012121001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006060503 + 10006060504.

It is an arithmetic number, because the mean of its divisors is an integer number (10006060504).

Almost surely, 2^20012121007 is an apocalyptic number.

20012121007 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012121007 is an equidigital number, since it uses as much as digits as its factorization.

20012121007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 16.

Adding to 20012121007 its reverse (70012121002), we get a palindrome (90024242009).

The spelling of 20012121007 in words is "twenty billion, twelve million, one hundred twenty-one thousand, seven".