20021320123031 has 2 divisors, whose sum is σ = 20021320123032. Its totient is φ = 20021320123030.

The previous prime is 20021320122967. The next prime is 20021320123033. The reversal of 20021320123031 is 13032102312002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20021320123031 - 2⁶ = 20021320122967 is a prime.

It is a super-2 number, since 2×20021320123031² (a number of 27 digits) contains 22 as substring.

Together with 20021320123033, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20021320122994 and 20021320123012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021320123033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010660061515 + 10010660061516.

It is an arithmetic number, because the mean of its divisors is an integer number (10010660061516).

Almost surely, 2^{20021320123031} is an apocalyptic number.

20021320123031 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021320123031 is an equidigital number, since it uses as much as digits as its factorization.

20021320123031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 20021320123031 its reverse (13032102312002), we get a palindrome (33053422435033).

The spelling of 20021320123031 in words is "twenty trillion, twenty-one billion, three hundred twenty million, one hundred twenty-three thousand, thirty-one".