20121307 has 2 divisors, whose sum is σ = 20121308. Its totient is φ = 20121306.

The previous prime is 20121287. The next prime is 20121337. The reversal of 20121307 is 70312102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20121307 - 2¹⁵ = 20088539 is a prime.

It is not a weakly prime, because it can be changed into another prime (20121337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060653 + 10060654.

It is an arithmetic number, because the mean of its divisors is an integer number (10060654).

Almost surely, 2^20121307 is an apocalyptic number.

20121307 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121307 is an equidigital number, since it uses as much as digits as its factorization.

20121307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 20121307 is about 4485.6779866593. The cubic root of 20121307 is about 271.9894522654.

Adding to 20121307 its reverse (70312102), we get a palindrome (90433409).

The spelling of 20121307 in words is "twenty million, one hundred twenty-one thousand, three hundred seven".