20306250121 has 2 divisors, whose sum is σ = 20306250122. Its totient is φ = 20306250120.

The previous prime is 20306250119. The next prime is 20306250179. The reversal of 20306250121 is 12105260302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20306250000 + 121 = 142500^2 + 11^2 .

It is a cyclic number.

It is not a de Polignac number, because 20306250121 - 2¹ = 20306250119 is a prime.

It is a super-2 number, since 2×20306250121² (a number of 21 digits) contains 22 as substring.

Together with 20306250119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20306250092 and 20306250101.

It is not a weakly prime, because it can be changed into another prime (20306250101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10153125060 + 10153125061.

It is an arithmetic number, because the mean of its divisors is an integer number (10153125061).

Almost surely, 2^20306250121 is an apocalyptic number.

It is an amenable number.

20306250121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20306250121 is an equidigital number, since it uses as much as digits as its factorization.

20306250121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 22.

The spelling of 20306250121 in words is "twenty billion, three hundred six million, two hundred fifty thousand, one hundred twenty-one".