20121022123 has 2 divisors, whose sum is σ = 20121022124. Its totient is φ = 20121022122.

The previous prime is 20121022111. The next prime is 20121022139. The reversal of 20121022123 is 32122012102.

It is a happy number.

It is an a-pointer prime, because the next prime (20121022139) can be obtained adding 20121022123 to its sum of digits (16).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20121022123 - 2²¹ = 20118924971 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20121022097 and 20121022106.

It is not a weakly prime, because it can be changed into another prime (20121002123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060511061 + 10060511062.

It is an arithmetic number, because the mean of its divisors is an integer number (10060511062).

Almost surely, 2^20121022123 is an apocalyptic number.

20121022123 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121022123 is an equidigital number, since it uses as much as digits as its factorization.

20121022123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20121022123 its reverse (32122012102), we get a palindrome (52243034225).

The spelling of 20121022123 in words is "twenty billion, one hundred twenty-one million, twenty-two thousand, one hundred twenty-three".