12021040420 has 24 divisors (see below), whose sum is σ = 25301707200. Its totient is φ = 4797459552.

The previous prime is 12021040379. The next prime is 12021040429. The reversal of 12021040420 is 2404012021.

It is a junction number, because it is equal to n+sod(n) for n = 12021040394 and 12021040403.

It is not an unprimeable number, because it can be changed into a prime (12021040429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 675790 + ... + 693349.

It is an arithmetic number, because the mean of its divisors is an integer number (1054237800).

Almost surely, 2^12021040420 is an apocalyptic number.

12021040420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12021040420 is an abundant number, since it is smaller than the sum of its proper divisors (13280666780).

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

12021040420 is a wasteful number, since it uses less digits than its factorization.

12021040420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369587 (or 1369585 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 12021040420 its reverse (2404012021), we get a palindrome (14425052441).

The spelling of 12021040420 in words is "twelve billion, twenty-one million, forty thousand, four hundred twenty".