2121101420 has 48 divisors (see below), whose sum is σ = 4588768800. Its totient is φ = 823097856.

The previous prime is 2121101401. The next prime is 2121101429. The reversal of 2121101420 is 241011212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2121101395 and 2121101404.

It is not an unprimeable number, because it can be changed into a prime (2121101429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119864 + ... + 136416.

It is an arithmetic number, because the mean of its divisors is an integer number (95599350).

Almost surely, 2^2121101420 is an apocalyptic number.

2121101420 is a gapful number since it is divisible by the number (20) 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 2121101420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2294384400).

2121101420 is an abundant number, since it is smaller than the sum of its proper divisors (2467667380).

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

2121101420 is a wasteful number, since it uses less digits than its factorization.

2121101420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16754 (or 16752 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2121101420 is about 46055.4168366762. The cubic root of 2121101420 is about 1284.8540907371.

Adding to 2121101420 its reverse (241011212), we get a palindrome (2362112632).

The spelling of 2121101420 in words is "two billion, one hundred twenty-one million, one hundred one thousand, four hundred twenty".