2121521386 has 16 divisors (see below), whose sum is σ = 3207432384. Its totient is φ = 1052410464.

The previous prime is 2121521383. The next prime is 2121521387. The reversal of 2121521386 is 6831251212.

It is not an unprimeable number, because it can be changed into a prime (2121521383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123835 + ... + 139921.

It is an arithmetic number, because the mean of its divisors is an integer number (200464524).

Almost surely, 2^2121521386 is an apocalyptic number.

2121521386 is a deficient number, since it is larger than the sum of its proper divisors (1085910998).

2121521386 is a wasteful number, since it uses less digits than its factorization.

2121521386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16605.

The product of its digits is 5760, while the sum is 31.

The square root of 2121521386 is about 46059.9759661249. The cubic root of 2121521386 is about 1284.9388830718.

Adding to 2121521386 its reverse (6831251212), we get a palindrome (8952772598).

The spelling of 2121521386 in words is "two billion, one hundred twenty-one million, five hundred twenty-one thousand, three hundred eighty-six".