12021405140 has 12 divisors (see below), whose sum is σ = 25244950836. Its totient is φ = 4808562048.

The previous prime is 12021405139. The next prime is 12021405157. The reversal of 12021405140 is 4150412021.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1819193104 + 10202212036 = 42652^2 + 101006^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 601070257 = 12021405140 / (1 + 2 + 0 + 2 + 1 + 4 + 0 + 5 + 1 + 4 + 0).

It is a congruent number.

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, 300535109 + ... + 300535148.

It is an arithmetic number, because the mean of its divisors is an integer number (2103745903).

Almost surely, 2^12021405140 is an apocalyptic number.

12021405140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12021405140 is an abundant number, since it is smaller than the sum of its proper divisors (13223545696).

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

12021405140 is a wasteful number, since it uses less digits than its factorization.

12021405140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601070266 (or 601070264 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 12021405140 its reverse (4150412021), we get a palindrome (16171817161).

The spelling of 12021405140 in words is "twelve billion, twenty-one million, four hundred five thousand, one hundred forty".