123012821507 has 2 divisors, whose sum is σ = 123012821508. Its totient is φ = 123012821506.

The previous prime is 123012821483. The next prime is 123012821531. The reversal of 123012821507 is 705128210321.

It is a balanced prime because it is at equal distance from previous prime (123012821483) and next prime (123012821531).

It is a cyclic number.

It is not a de Polignac number, because 123012821507 - 2¹⁸ = 123012559363 is a prime.

It is a super-2 number, since 2×123012821507² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123012881507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61506410753 + 61506410754.

It is an arithmetic number, because the mean of its divisors is an integer number (61506410754).

Almost surely, 2^123012821507 is an apocalyptic number.

123012821507 is a deficient number, since it is larger than the sum of its proper divisors (1).

123012821507 is an equidigital number, since it uses as much as digits as its factorization.

123012821507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 32.

The spelling of 123012821507 in words is "one hundred twenty-three billion, twelve million, eight hundred twenty-one thousand, five hundred seven".