20421225113 has 2 divisors, whose sum is σ = 20421225114. Its totient is φ = 20421225112.

The previous prime is 20421225109. The next prime is 20421225173. The reversal of 20421225113 is 31152212402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11245117849 + 9176107264 = 106043^2 + 95792^2 .

It is a cyclic number.

It is not a de Polignac number, because 20421225113 - 2² = 20421225109 is a prime.

It is not a weakly prime, because it can be changed into another prime (20421225103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210612556 + 10210612557.

It is an arithmetic number, because the mean of its divisors is an integer number (10210612557).

Almost surely, 2^20421225113 is an apocalyptic number.

It is an amenable number.

20421225113 is a deficient number, since it is larger than the sum of its proper divisors (1).

20421225113 is an equidigital number, since it uses as much as digits as its factorization.

20421225113 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 20421225113 its reverse (31152212402), we get a palindrome (51573437515).

The spelling of 20421225113 in words is "twenty billion, four hundred twenty-one million, two hundred twenty-five thousand, one hundred thirteen".