2356921 has 4 divisors (see below), whose sum is σ = 2693632. Its totient is φ = 2020212.

The previous prime is 2356919. The next prime is 2356927. The reversal of 2356921 is 1296532.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2356921 - 2¹ = 2356919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2356921.

It is not an unprimeable number, because it can be changed into a prime (2356927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168345 + ... + 168358.

It is an arithmetic number, because the mean of its divisors is an integer number (673408).

2^2356921 is an apocalyptic number.

It is an amenable number.

2356921 is a deficient number, since it is larger than the sum of its proper divisors (336711).

2356921 is an equidigital number, since it uses as much as digits as its factorization.

2356921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336710.

The product of its digits is 3240, while the sum is 28.

The square root of 2356921 is about 1535.2266933583. The cubic root of 2356921 is about 133.0806791854.

The spelling of 2356921 in words is "two million, three hundred fifty-six thousand, nine hundred twenty-one".