2152021521 has 16 divisors (see below), whose sum is σ = 3098047680. Its totient is φ = 1320907200.

The previous prime is 2152021507. The next prime is 2152021523. The reversal of 2152021521 is 1251202512.

It is not a de Polignac number, because 2152021521 - 2¹⁵ = 2151988753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2152021523) 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 15 ways as a sum of consecutive naturals, for example, 55755 + ... + 86096.

It is an arithmetic number, because the mean of its divisors is an integer number (193627980).

Almost surely, 2^2152021521 is an apocalyptic number.

It is an amenable number.

2152021521 is a deficient number, since it is larger than the sum of its proper divisors (946026159).

2152021521 is a wasteful number, since it uses less digits than its factorization.

2152021521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142256.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 2152021521 is about 46389.8859774412. The cubic root of 2152021521 is about 1291.0672659166.

The spelling of 2152021521 in words is "two billion, one hundred fifty-two million, twenty-one thousand, five hundred twenty-one".