123121121507 has 2 divisors, whose sum is σ = 123121121508. Its totient is φ = 123121121506.

The previous prime is 123121121447. The next prime is 123121121527. The reversal of 123121121507 is 705121121321.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123121121507 - 2¹² = 123121117411 is a prime.

It is a super-2 number, since 2×123121121507² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123121121527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61560560753 + 61560560754.

It is an arithmetic number, because the mean of its divisors is an integer number (61560560754).

Almost surely, 2^123121121507 is an apocalyptic number.

123121121507 is a deficient number, since it is larger than the sum of its proper divisors (1).

123121121507 is an equidigital number, since it uses as much as digits as its factorization.

123121121507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 26.

Adding to 123121121507 its reverse (705121121321), we get a palindrome (828242242828).

The spelling of 123121121507 in words is "one hundred twenty-three billion, one hundred twenty-one million, one hundred twenty-one thousand, five hundred seven".