2221761 has 8 divisors (see below), whose sum is σ = 2969824. Its totient is φ = 1477440.

The previous prime is 2221757. The next prime is 2221771. The reversal of 2221761 is 1671222.

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

It is not a de Polignac number, because 2221761 - 2² = 2221757 is a prime.

It is a super-2 number, since 2×2221761² = 9872443882242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2221711) 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, 1065 + ... + 2361.

It is an arithmetic number, because the mean of its divisors is an integer number (371228).

2^2221761 is an apocalyptic number.

It is an amenable number.

2221761 is a deficient number, since it is larger than the sum of its proper divisors (748063).

2221761 is a wasteful number, since it uses less digits than its factorization.

2221761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1871.

The product of its digits is 336, while the sum is 21.

The square root of 2221761 is about 1490.5572783359. The cubic root of 2221761 is about 130.4865592945.

Adding to 2221761 its reverse (1671222), we get a palindrome (3892983).

The spelling of 2221761 in words is "two million, two hundred twenty-one thousand, seven hundred sixty-one".