22021761 has 12 divisors (see below), whose sum is σ = 29890896. Its totient is φ = 14418360.

The previous prime is 22021739. The next prime is 22021799. The reversal of 22021761 is 16712022.

It is not a de Polignac number, because 22021761 - 2⁵ = 22021729 is a prime.

It is a super-2 number, since 2×22021761² = 969915915082242, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22021711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66366 + ... + 66696.

It is an arithmetic number, because the mean of its divisors is an integer number (2490908).

Almost surely, 2^22021761 is an apocalyptic number.

It is an amenable number.

22021761 is a deficient number, since it is larger than the sum of its proper divisors (7869135).

22021761 is an frugal number, since it uses more digits than its factorization.

22021761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732 (or 401 counting only the distinct ones).

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

The square root of 22021761 is about 4692.7349168688. The cubic root of 22021761 is about 280.2962892544.

Adding to 22021761 its reverse (16712022), we get a palindrome (38733783).

The spelling of 22021761 in words is "twenty-two million, twenty-one thousand, seven hundred sixty-one".