2152809021 has 8 divisors (see below), whose sum is σ = 3131358624. Its totient is φ = 1304732720.

The previous prime is 2152809019. The next prime is 2152809023. The reversal of 2152809021 is 1209082512.

It is an interprime number because it is at equal distance from previous prime (2152809019) and next prime (2152809023).

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

It is a cyclic number.

It is not a de Polignac number, because 2152809021 - 2¹ = 2152809019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2152809021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2152809023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32618286 + ... + 32618351.

It is an arithmetic number, because the mean of its divisors is an integer number (391419828).

Almost surely, 2^2152809021 is an apocalyptic number.

It is an amenable number.

2152809021 is a deficient number, since it is larger than the sum of its proper divisors (978549603).

2152809021 is a wasteful number, since it uses less digits than its factorization.

2152809021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65236651.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 2152809021 is about 46398.3730425971. The cubic root of 2152809021 is about 1291.2247289454.

The spelling of 2152809021 in words is "two billion, one hundred fifty-two million, eight hundred nine thousand, twenty-one".