2121506215 has 8 divisors (see below), whose sum is σ = 2546723088. Its totient is φ = 1696594560.

The previous prime is 2121506209. The next prime is 2121506267. The reversal of 2121506215 is 5126051212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2121506215 - 2⁷ = 2121506087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121506215.

It is a congruent number.

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, 60721 + ... + 89050.

It is an arithmetic number, because the mean of its divisors is an integer number (318340386).

Almost surely, 2^2121506215 is an apocalyptic number.

2121506215 is a deficient number, since it is larger than the sum of its proper divisors (425216873).

2121506215 is a wasteful number, since it uses less digits than its factorization.

2121506215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152609.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 2121506215 is about 46059.8112783802. The cubic root of 2121506215 is about 1284.9358201984.

Adding to 2121506215 its reverse (5126051212), we get a palindrome (7247557427).

The spelling of 2121506215 in words is "two billion, one hundred twenty-one million, five hundred six thousand, two hundred fifteen".