2070721 has 3 divisors (see below), whose sum is σ = 2072161. Its totient is φ = 2069282.

The previous prime is 2070709. The next prime is 2070737. The reversal of 2070721 is 1270702.

The square root of 2070721 is 1439.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1270702 = 2 ⋅635351.

It is not a de Polignac number, because 2070721 - 2¹¹ = 2068673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2070781) 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 2 ways as a sum of consecutive naturals, for example, 720 + ... + 2158.

2^2070721 is an apocalyptic number.

2070721 is the 1439-th square number.

2070721 is the 720-th centered octagonal number.

It is an amenable number.

2070721 is a deficient number, since it is larger than the sum of its proper divisors (1440).

2070721 is an frugal number, since it uses more digits than its factorization.

2070721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2878 (or 1439 counting only the distinct ones).

The product of its (nonzero) digits is 196, while the sum is 19.

The cubic root of 2070721 is about 127.4599848797.

Subtracting from 2070721 its sum of digits (19), we obtain a palindrome (2070702).

Multiplying 2070721 by its product of nonzero digits (196), we get a square (405861316 = 20146²).

The spelling of 2070721 in words is "two million, seventy thousand, seven hundred twenty-one".