13123220240 has 40 divisors (see below), whose sum is σ = 32858527128. Its totient is φ = 4845496320.

The previous prime is 13123220191. The next prime is 13123220251. The reversal of 13123220240 is 4202232131.

It can be written as a sum of positive squares in 4 ways, for example, as 46840336 + 13076379904 = 6844^2 + 114352^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6308201 + ... + 6310280.

Almost surely, 2^13123220240 is an apocalyptic number.

13123220240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13123220240 is an abundant number, since it is smaller than the sum of its proper divisors (19735306888).

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

13123220240 is a wasteful number, since it uses less digits than its factorization.

13123220240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12618507 (or 12618501 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 13123220240 its reverse (4202232131), we get a palindrome (17325452371).

The spelling of 13123220240 in words is "thirteen billion, one hundred twenty-three million, two hundred twenty thousand, two hundred forty".