121928123 has 2 divisors, whose sum is σ = 121928124. Its totient is φ = 121928122.

The previous prime is 121928101. The next prime is 121928171. The reversal of 121928123 is 321829121.

It is a weak prime.

It is an emirp because it is prime and its reverse (321829121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121928123 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (121928923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60964061 + 60964062.

It is an arithmetic number, because the mean of its divisors is an integer number (60964062).

Almost surely, 2^121928123 is an apocalyptic number.

121928123 is a deficient number, since it is larger than the sum of its proper divisors (1).

121928123 is an equidigital number, since it uses as much as digits as its factorization.

121928123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 29.

The square root of 121928123 is about 11042.1068189001. The cubic root of 121928123 is about 495.8701465374.

The spelling of 121928123 in words is "one hundred twenty-one million, nine hundred twenty-eight thousand, one hundred twenty-three".