2141521220 has 24 divisors (see below), whose sum is σ = 4508539224. Its totient is φ = 854447616.

The previous prime is 2141521183. The next prime is 2141521231. The reversal of 2141521220 is 221251412.

It can be written as a sum of positive squares in 4 ways, for example, as 749335876 + 1392185344 = 27374^2 + 37312^2 .

It is a super-2 number, since 2×2141521220² = 9172226271420576800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2141521192 and 2141521201.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126917 + ... + 142796.

It is an arithmetic number, because the mean of its divisors is an integer number (187855801).

Almost surely, 2^2141521220 is an apocalyptic number.

2141521220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2141521220 is an abundant number, since it is smaller than the sum of its proper divisors (2367018004).

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

2141521220 is a wasteful number, since it uses less digits than its factorization.

2141521220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270119 (or 270117 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 2141521220 is about 46276.5731229096. The cubic root of 2141521220 is about 1288.9640181082.

Adding to 2141521220 its reverse (221251412), we get a palindrome (2362772632).

The spelling of 2141521220 in words is "two billion, one hundred forty-one million, five hundred twenty-one thousand, two hundred twenty".