2151521533 has 4 divisors (see below), whose sum is σ = 2458881760. Its totient is φ = 1844161308.

The previous prime is 2151521531. The next prime is 2151521539. The reversal of 2151521533 is 3351251512.

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 2151521533 - 2¹ = 2151521531 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151521531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153680103 + ... + 153680116.

It is an arithmetic number, because the mean of its divisors is an integer number (614720440).

Almost surely, 2^2151521533 is an apocalyptic number.

It is an amenable number.

2151521533 is a deficient number, since it is larger than the sum of its proper divisors (307360227).

2151521533 is an equidigital number, since it uses as much as digits as its factorization.

2151521533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307360226.

The product of its digits is 4500, while the sum is 28.

The square root of 2151521533 is about 46384.4966880099. The cubic root of 2151521533 is about 1290.9672718518.

The spelling of 2151521533 in words is "two billion, one hundred fifty-one million, five hundred twenty-one thousand, five hundred thirty-three".