2121015530 has 24 divisors (see below), whose sum is σ = 3900827268. Its totient is φ = 830346368.

The previous prime is 2121015529. The next prime is 2121015539. The reversal of 2121015530 is 355101212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1881911161 + 239104369 = 43381^2 + 15463^2 .

It is not an unprimeable number, because it can be changed into a prime (2121015539) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25919 + ... + 70098.

Almost surely, 2^2121015530 is an apocalyptic number.

2121015530 is a deficient number, since it is larger than the sum of its proper divisors (1779811738).

2121015530 is an equidigital number, since it uses as much as digits as its factorization.

2121015530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96118 (or 96071 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 2121015530 is about 46054.4843636317. The cubic root of 2121015530 is about 1284.8367479223.

Adding to 2121015530 its reverse (355101212), we get a palindrome (2476116742).

The spelling of 2121015530 in words is "two billion, one hundred twenty-one million, fifteen thousand, five hundred thirty".