2071921 has 2 divisors, whose sum is σ = 2071922. Its totient is φ = 2071920.

The previous prime is 2071913. The next prime is 2071939. The reversal of 2071921 is 1291702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2002225 + 69696 = 1415^2 + 264^2 .

It is a cyclic number.

It is not a de Polignac number, because 2071921 - 2³ = 2071913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2071892 and 2071901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2071961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1035960 + 1035961.

It is an arithmetic number, because the mean of its divisors is an integer number (1035961).

2^2071921 is an apocalyptic number.

It is an amenable number.

2071921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2071921 is an equidigital number, since it uses as much as digits as its factorization.

2071921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 2071921 is about 1439.4168958297. The cubic root of 2071921 is about 127.4846014980.

It can be divided in two parts, 2071 and 921, that added together give a palindrome (2992).

The spelling of 2071921 in words is "two million, seventy-one thousand, nine hundred twenty-one".