20200121113 has 2 divisors, whose sum is σ = 20200121114. Its totient is φ = 20200121112.

The previous prime is 20200121107. The next prime is 20200121131. The reversal of 20200121113 is 31112100202.

Together with next prime (20200121131) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20194399449 + 5721664 = 142107^2 + 2392^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20200121113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20200121093 and 20200121102.

It is not a weakly prime, because it can be changed into another prime (20200121713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100060556 + 10100060557.

It is an arithmetic number, because the mean of its divisors is an integer number (10100060557).

Almost surely, 2^20200121113 is an apocalyptic number.

It is an amenable number.

20200121113 is a deficient number, since it is larger than the sum of its proper divisors (1).

20200121113 is an equidigital number, since it uses as much as digits as its factorization.

20200121113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20200121113 its reverse (31112100202), we get a palindrome (51312221315).

The spelling of 20200121113 in words is "twenty billion, two hundred million, one hundred twenty-one thousand, one hundred thirteen".