12101421420 has 144 divisors (see below), whose sum is σ = 41021678880. Its totient is φ = 2862105600.

The previous prime is 12101421407. The next prime is 12101421421. The reversal of 12101421420 is 2412410121.

12101421420 is a `hidden beast` number, since 1 + 210 + 14 + 21 + 420 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12101421393 and 12101421402.

It is not an unprimeable number, because it can be changed into a prime (12101421421) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6646 + ... + 155714.

It is an arithmetic number, because the mean of its divisors is an integer number (284872770).

Almost surely, 2^12101421420 is an apocalyptic number.

12101421420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12101421420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20510839440).

12101421420 is an abundant number, since it is smaller than the sum of its proper divisors (28920257460).

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

12101421420 is a wasteful number, since it uses less digits than its factorization.

12101421420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149136 (or 149131 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12101421420 its reverse (2412410121), we get a palindrome (14513831541).

The spelling of 12101421420 in words is "twelve billion, one hundred one million, four hundred twenty-one thousand, four hundred twenty".