2150515721 has 4 divisors (see below), whose sum is σ = 2186965200. Its totient is φ = 2114066244.

The previous prime is 2150515711. The next prime is 2150515727. The reversal of 2150515721 is 1275150512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2150515721 - 2¹⁸ = 2150253577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2150515727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18224651 + ... + 18224768.

It is an arithmetic number, because the mean of its divisors is an integer number (546741300).

Almost surely, 2^2150515721 is an apocalyptic number.

It is an amenable number.

2150515721 is a deficient number, since it is larger than the sum of its proper divisors (36449479).

2150515721 is an equidigital number, since it uses as much as digits as its factorization.

2150515721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36449478.

The product of its (nonzero) digits is 3500, while the sum is 29.

The square root of 2150515721 is about 46373.6533065921. The cubic root of 2150515721 is about 1290.7660696256.

The spelling of 2150515721 in words is "two billion, one hundred fifty million, five hundred fifteen thousand, seven hundred twenty-one".