4021521120 has 144 divisors (see below), whose sum is σ = 14094531360. Its totient is φ = 1043407872.

The previous prime is 4021521073. The next prime is 4021521223. The reversal of 4021521120 is 211251204.

4021521120 is a `hidden beast` number, since 4 + 0 + 21 + 521 + 120 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

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 = 4021521093 and 4021521102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15541 + ... + 91019.

It is an arithmetic number, because the mean of its divisors is an integer number (97878690).

Almost surely, 2^4021521120 is an apocalyptic number.

4021521120 is a gapful number since it is divisible by the number (40) 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 4021521120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7047265680).

4021521120 is an abundant number, since it is smaller than the sum of its proper divisors (10073010240).

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

4021521120 is a wasteful number, since it uses less digits than its factorization.

4021521120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75537 (or 75526 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 4021521120 is about 63415.4643600439. The cubic root of 4021521120 is about 1590.2428488683.

Adding to 4021521120 its reverse (211251204), we get a palindrome (4232772324).

The spelling of 4021521120 in words is "four billion, twenty-one million, five hundred twenty-one thousand, one hundred twenty".