42123290929 has 2 divisors, whose sum is σ = 42123290930. Its totient is φ = 42123290928.

The previous prime is 42123290927. The next prime is 42123290939. The reversal of 42123290929 is 92909232124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28932309025 + 13190981904 = 170095^2 + 114852^2 .

It is a cyclic number.

It is not a de Polignac number, because 42123290929 - 2¹ = 42123290927 is a prime.

Together with 42123290927, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42123290927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21061645464 + 21061645465.

It is an arithmetic number, because the mean of its divisors is an integer number (21061645465).

Almost surely, 2^42123290929 is an apocalyptic number.

It is an amenable number.

42123290929 is a deficient number, since it is larger than the sum of its proper divisors (1).

42123290929 is an equidigital number, since it uses as much as digits as its factorization.

42123290929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 43.

The spelling of 42123290929 in words is "forty-two billion, one hundred twenty-three million, two hundred ninety thousand, nine hundred twenty-nine".