2621421 has 12 divisors (see below), whose sum is σ = 4130880. Its totient is φ = 1588680.

The previous prime is 2621387. The next prime is 2621431. The reversal of 2621421 is 1241262.

2621421 is a `hidden beast` number, since 2 + 621 + 42 + 1 = 666.

It is not a de Polignac number, because 2621421 - 2⁹ = 2620909 is a prime.

It is a Curzon number.

2621421 is a lucky number.

It is a zygodrome in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 2621394 and 2621403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2621431) 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, 13141 + ... + 13338.

It is an arithmetic number, because the mean of its divisors is an integer number (344240).

2^2621421 is an apocalyptic number.

It is an amenable number.

2621421 is a deficient number, since it is larger than the sum of its proper divisors (1509459).

2621421 is a wasteful number, since it uses less digits than its factorization.

2621421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26496 (or 26493 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 2621421 is about 1619.0802944882. The cubic root of 2621421 is about 137.8834870374.

Adding to 2621421 its reverse (1241262), we get a palindrome (3862683).

The spelling of 2621421 in words is "two million, six hundred twenty-one thousand, four hundred twenty-one".