2021401220 has 24 divisors (see below), whose sum is σ = 4258346904. Its totient is φ = 806007296.

The previous prime is 2021401157. The next prime is 2021401223. The reversal of 2021401220 is 221041202.

It can be written as a sum of positive squares in 4 ways, for example, as 5750404 + 2015650816 = 2398^2 + 44896^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2021401195 and 2021401204.

It is not an unprimeable number, because it can be changed into a prime (2021401223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153077 + ... + 165756.

It is an arithmetic number, because the mean of its divisors is an integer number (177431121).

Almost surely, 2^2021401220 is an apocalyptic number.

2021401220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021401220 is an abundant number, since it is smaller than the sum of its proper divisors (2236945684).

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

2021401220 is a wasteful number, since it uses less digits than its factorization.

2021401220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319159 (or 319157 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 2021401220 is about 44959.9957740212. The cubic root of 2021401220 is about 1264.3990896839.

Adding to 2021401220 its reverse (221041202), we get a palindrome (2242442422).

The spelling of 2021401220 in words is "two billion, twenty-one million, four hundred one thousand, two hundred twenty".