2091321 has 12 divisors (see below), whose sum is σ = 3152448. Its totient is φ = 1333464.

The previous prime is 2091319. The next prime is 2091337. The reversal of 2091321 is 1231902.

It is a happy number.

It is not a de Polignac number, because 2091321 - 2¹ = 2091319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2091294 and 2091303.

It is not an unprimeable number, because it can be changed into a prime (2091301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4845 + ... + 5258.

It is an arithmetic number, because the mean of its divisors is an integer number (262704).

2^2091321 is an apocalyptic number.

It is an amenable number.

2091321 is a deficient number, since it is larger than the sum of its proper divisors (1061127).

2091321 is a wasteful number, since it uses less digits than its factorization.

2091321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10132 (or 10129 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 2091321 is about 1446.1400347131. The cubic root of 2091321 is about 127.8812578815.

The spelling of 2091321 in words is "two million, ninety-one thousand, three hundred twenty-one".