123215320420 has 12 divisors (see below), whose sum is σ = 258752172924. Its totient is φ = 49286128160.

The previous prime is 123215320351. The next prime is 123215320447. The reversal of 123215320420 is 24023512321.

It can be written as a sum of positive squares in 2 ways, for example, as 53443267684 + 69772052736 = 231178^2 + 264144^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3080382991 + ... + 3080383030.

It is an arithmetic number, because the mean of its divisors is an integer number (21562681077).

Almost surely, 2^123215320420 is an apocalyptic number.

123215320420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123215320420 is an abundant number, since it is smaller than the sum of its proper divisors (135536852504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123215320420 is a wasteful number, since it uses less digits than its factorization.

123215320420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6160766030 (or 6160766028 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 123215320420 its reverse (24023512321), we get a palindrome (147238832741).

The spelling of 123215320420 in words is "one hundred twenty-three billion, two hundred fifteen million, three hundred twenty thousand, four hundred twenty".