123415434021 has 32 divisors (see below), whose sum is σ = 200076825600. Its totient is φ = 66692263680.

The previous prime is 123415434013. The next prime is 123415434041. The reversal of 123415434021 is 120434514321.

It is not a de Polignac number, because 123415434021 - 2³ = 123415434013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123415434021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123415434011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5778601 + ... + 5799918.

It is an arithmetic number, because the mean of its divisors is an integer number (6252400800).

Almost surely, 2^123415434021 is an apocalyptic number.

123415434021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

123415434021 is a deficient number, since it is larger than the sum of its proper divisors (76661391579).

123415434021 is a wasteful number, since it uses less digits than its factorization.

123415434021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11578569.

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 123415434021 its reverse (120434514321), we get a palindrome (243849948342).

The spelling of 123415434021 in words is "one hundred twenty-three billion, four hundred fifteen million, four hundred thirty-four thousand, twenty-one".