2045421 has 12 divisors (see below), whose sum is σ = 3376672. Its totient is φ = 1168776.

The previous prime is 2045377. The next prime is 2045437. The reversal of 2045421 is 1245402.

It is not a de Polignac number, because 2045421 - 2⁶ = 2045357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2045394 and 2045403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2045441) 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, 16171 + ... + 16296.

2^2045421 is an apocalyptic number.

2045421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2045421 is a deficient number, since it is larger than the sum of its proper divisors (1331251).

2045421 is a wasteful number, since it uses less digits than its factorization.

2045421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32480 (or 32477 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 2045421 is about 1430.1821562305. The cubic root of 2045421 is about 126.9387556813.

It can be divided in two parts, 204 and 5421, that added together give a square (5625 = 75²).

The spelling of 2045421 in words is "two million, forty-five thousand, four hundred twenty-one".