2120201521 has 16 divisors (see below), whose sum is σ = 2192400000. Its totient is φ = 2049480576.

The previous prime is 2120201509. The next prime is 2120201549. The reversal of 2120201521 is 1251020212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2120201521 - 2⁹ = 2120201009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2120201495 and 2120201504.

It is not an unprimeable number, because it can be changed into a prime (2120201021) 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, 1043935 + ... + 1045963.

It is an arithmetic number, because the mean of its divisors is an integer number (137025000).

Almost surely, 2^2120201521 is an apocalyptic number.

It is an amenable number.

2120201521 is a deficient number, since it is larger than the sum of its proper divisors (72198479).

2120201521 is a wasteful number, since it uses less digits than its factorization.

2120201521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2376.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 2120201521 is about 46045.6460591010. The cubic root of 2120201521 is about 1284.6723608656.

Adding to 2120201521 its reverse (1251020212), we get a palindrome (3371221733).

The spelling of 2120201521 in words is "two billion, one hundred twenty million, two hundred one thousand, five hundred twenty-one".