20321012123 has 2 divisors, whose sum is σ = 20321012124. Its totient is φ = 20321012122.

The previous prime is 20321012087. The next prime is 20321012137. The reversal of 20321012123 is 32121012302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20321012123 - 2¹² = 20321008027 is a prime.

It is a super-2 number, since 2×20321012123² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20321012143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160506061 + 10160506062.

It is an arithmetic number, because the mean of its divisors is an integer number (10160506062).

Almost surely, 2^20321012123 is an apocalyptic number.

20321012123 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321012123 is an equidigital number, since it uses as much as digits as its factorization.

20321012123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20321012123 its reverse (32121012302), we get a palindrome (52442024425).

The spelling of 20321012123 in words is "twenty billion, three hundred twenty-one million, twelve thousand, one hundred twenty-three".