2251921 has 8 divisors (see below), whose sum is σ = 2583360. Its totient is φ = 1922928.

The previous prime is 2251913. The next prime is 2251927. The reversal of 2251921 is 1291522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2251921 - 2³ = 2251913 is a prime.

It is a super-2 number, since 2×2251921² = 10142296380482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2251892 and 2251901.

It is not an unprimeable number, because it can be changed into a prime (2251927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2310 + ... + 3136.

It is an arithmetic number, because the mean of its divisors is an integer number (322920).

2^2251921 is an apocalyptic number.

It is an amenable number.

2251921 is a deficient number, since it is larger than the sum of its proper divisors (331439).

2251921 is an equidigital number, since it uses as much as digits as its factorization.

2251921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1223.

The product of its digits is 360, while the sum is 22.

The square root of 2251921 is about 1500.6401967161. The cubic root of 2251921 is about 131.0743512818.

The spelling of 2251921 in words is "two million, two hundred fifty-one thousand, nine hundred twenty-one".