123021047 has 2 divisors, whose sum is σ = 123021048. Its totient is φ = 123021046.

The previous prime is 123021013. The next prime is 123021049. The reversal of 123021047 is 740120321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123021047 - 2⁶ = 123020983 is a prime.

It is a super-3 number, since 3×123021047³ (a number of 25 digits) contains 333 as substring.

Together with 123021049, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123021049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61510523 + 61510524.

It is an arithmetic number, because the mean of its divisors is an integer number (61510524).

Almost surely, 2^123021047 is an apocalyptic number.

123021047 is a deficient number, since it is larger than the sum of its proper divisors (1).

123021047 is an equidigital number, since it uses as much as digits as its factorization.

123021047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 123021047 is about 11091.4853378617. The cubic root of 123021047 is about 497.3473477596.

Adding to 123021047 its reverse (740120321), we get a palindrome (863141368).

The spelling of 123021047 in words is "one hundred twenty-three million, twenty-one thousand, forty-seven".