2150721 has 12 divisors (see below), whose sum is σ = 3289572. Its totient is φ = 1349376.

The previous prime is 2150719. The next prime is 2150741. The reversal of 2150721 is 1270512.

It can be written as a sum of positive squares in 2 ways, for example, as 746496 + 1404225 = 864^2 + 1185^2 .

It is not a de Polignac number, because 2150721 - 2¹ = 2150719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2150694 and 2150703.

It is not an unprimeable number, because it can be changed into a prime (2150741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6876 + ... + 7181.

It is an arithmetic number, because the mean of its divisors is an integer number (274131).

2^2150721 is an apocalyptic number.

It is an amenable number.

2150721 is a deficient number, since it is larger than the sum of its proper divisors (1138851).

2150721 is a wasteful number, since it uses less digits than its factorization.

2150721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14080 (or 14077 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 2150721 is about 1466.5336682122. The cubic root of 2150721 is about 129.0807138648.

It can be divided in two parts, 21507 and 21, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 2150721 in words is "two million, one hundred fifty thousand, seven hundred twenty-one".