2421761 has 12 divisors (see below), whose sum is σ = 2617020. Its totient is φ = 2237760.

The previous prime is 2421743. The next prime is 2421767. The reversal of 2421761 is 1671242.

It can be written as a sum of positive squares in 6 ways, for example, as 65536 + 2356225 = 256^2 + 1535^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2421761 is a prime.

It is a super-2 number, since 2×2421761² = 11729852682242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2421767) 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, 39671 + ... + 39731.

It is an arithmetic number, because the mean of its divisors is an integer number (218085).

2^2421761 is an apocalyptic number.

It is an amenable number.

2421761 is a deficient number, since it is larger than the sum of its proper divisors (195259).

2421761 is an equidigital number, since it uses as much as digits as its factorization.

2421761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 127 counting only the distinct ones).

The product of its digits is 672, while the sum is 23.

The square root of 2421761 is about 1556.2008225162. The cubic root of 2421761 is about 134.2900267537.

The spelling of 2421761 in words is "two million, four hundred twenty-one thousand, seven hundred sixty-one".