20021302123 has 2 divisors, whose sum is σ = 20021302124. Its totient is φ = 20021302122.

The previous prime is 20021302031. The next prime is 20021302129. The reversal of 20021302123 is 32120312002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20021302123 - 2¹³ = 20021293931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20021302097 and 20021302106.

It is not a weakly prime, because it can be changed into another prime (20021302129) 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, 10010651061 + 10010651062.

It is an arithmetic number, because the mean of its divisors is an integer number (10010651062).

Almost surely, 2^20021302123 is an apocalyptic number.

20021302123 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021302123 is an equidigital number, since it uses as much as digits as its factorization.

20021302123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 20021302123 its reverse (32120312002), we get a palindrome (52141614125).

The spelling of 20021302123 in words is "twenty billion, twenty-one million, three hundred two thousand, one hundred twenty-three".