20102123311 has 2 divisors, whose sum is σ = 20102123312. Its totient is φ = 20102123310.

The previous prime is 20102123281. The next prime is 20102123323. The reversal of 20102123311 is 11332120102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20102123311 - 2¹⁵ = 20102090543 is a prime.

It is a super-2 number, since 2×20102123311² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20102123351) 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, 10051061655 + 10051061656.

It is an arithmetic number, because the mean of its divisors is an integer number (10051061656).

Almost surely, 2^20102123311 is an apocalyptic number.

20102123311 is a deficient number, since it is larger than the sum of its proper divisors (1).

20102123311 is an equidigital number, since it uses as much as digits as its factorization.

20102123311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20102123311 its reverse (11332120102), we get a palindrome (31434243413).

The spelling of 20102123311 in words is "twenty billion, one hundred two million, one hundred twenty-three thousand, three hundred eleven".