2121442013420 has 24 divisors (see below), whose sum is σ = 4456686334464. Its totient is φ = 848260975616.

The previous prime is 2121442013419. The next prime is 2121442013429. The reversal of 2121442013420 is 243102441212.

It is a self number, because there is not a number n which added to its sum of digits gives 2121442013420.

It is not an unprimeable number, because it can be changed into a prime (2121442013429) 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, 19684277 + ... + 19791756.

It is an arithmetic number, because the mean of its divisors is an integer number (185695263936).

Almost surely, 2^{2121442013420} is an apocalyptic number.

2121442013420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121442013420 is an abundant number, since it is smaller than the sum of its proper divisors (2335244321044).

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

2121442013420 is a wasteful number, since it uses less digits than its factorization.

2121442013420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39478729 (or 39478727 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 2121442013420 its reverse (243102441212), we get a palindrome (2364544454632).

The spelling of 2121442013420 in words is "two trillion, one hundred twenty-one billion, four hundred forty-two million, thirteen thousand, four hundred twenty".