12023121440 has 72 divisors (see below), whose sum is σ = 31221662220. Its totient is φ = 4372037120.

The previous prime is 12023121379. The next prime is 12023121457. The reversal of 12023121440 is 4412132021.

It can be written as a sum of positive squares in 2 ways, for example, as 11422479376 + 600642064 = 106876^2 + 24508^2 .

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 11 ways as a sum of consecutive naturals, for example, 291155 + ... + 329874.

Almost surely, 2^12023121440 is an apocalyptic number.

12023121440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12023121440 is an abundant number, since it is smaller than the sum of its proper divisors (19198540780).

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

12023121440 is a wasteful number, since it uses less digits than its factorization.

12023121440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621066 (or 621047 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 12023121440 its reverse (4412132021), we get a palindrome (16435253461).

The spelling of 12023121440 in words is "twelve billion, twenty-three million, one hundred twenty-one thousand, four hundred forty".