8150121521 has 4 divisors (see below), whose sum is σ = 8629540452. Its totient is φ = 7670702592.

The previous prime is 8150121503. The next prime is 8150121559. The reversal of 8150121521 is 1251210518.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4113298225 + 4036823296 = 64135^2 + 63536^2 .

It is a cyclic number.

It is not a de Polignac number, because 8150121521 - 2⁶ = 8150121457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8150120521) 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, 239709440 + ... + 239709473.

It is an arithmetic number, because the mean of its divisors is an integer number (2157385113).

Almost surely, 2^8150121521 is an apocalyptic number.

It is an amenable number.

8150121521 is a deficient number, since it is larger than the sum of its proper divisors (479418931).

8150121521 is a wasteful number, since it uses less digits than its factorization.

8150121521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479418930.

The product of its (nonzero) digits is 800, while the sum is 26.

The square root of 8150121521 is about 90278.0234664007. The cubic root of 8150121521 is about 2012.4326808288.

The spelling of 8150121521 in words is "eight billion, one hundred fifty million, one hundred twenty-one thousand, five hundred twenty-one".