2152021549 has 2 divisors, whose sum is σ = 2152021550. Its totient is φ = 2152021548.

The previous prime is 2152021523. The next prime is 2152021577. The reversal of 2152021549 is 9451202512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1706516100 + 445505449 = 41310^2 + 21107^2 .

It is a cyclic number.

It is not a de Polignac number, because 2152021549 - 2⁹ = 2152021037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2152021549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2152021349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1076010774 + 1076010775.

It is an arithmetic number, because the mean of its divisors is an integer number (1076010775).

Almost surely, 2^2152021549 is an apocalyptic number.

It is an amenable number.

2152021549 is a deficient number, since it is larger than the sum of its proper divisors (1).

2152021549 is an equidigital number, since it uses as much as digits as its factorization.

2152021549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 2152021549 is about 46389.8862792312. The cubic root of 2152021549 is about 1291.0672715160.

The spelling of 2152021549 in words is "two billion, one hundred fifty-two million, twenty-one thousand, five hundred forty-nine".