22011661 has 16 divisors (see below), whose sum is σ = 25804800. Its totient is φ = 18386928.

The previous prime is 22011659. The next prime is 22011673. The reversal of 22011661 is 16611022.

It is not a de Polignac number, because 22011661 - 2¹ = 22011659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22011631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91980 + ... + 92218.

It is an arithmetic number, because the mean of its divisors is an integer number (1612800).

Almost surely, 2^22011661 is an apocalyptic number.

It is an amenable number.

22011661 is a deficient number, since it is larger than the sum of its proper divisors (3793139).

22011661 is a wasteful number, since it uses less digits than its factorization.

22011661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 22011661 is about 4691.6586619233. The cubic root of 22011661 is about 280.2534312615.

Adding to 22011661 its reverse (16611022), we get a palindrome (38622683).

It can be divided in two parts, 220 and 11661, that added together give a square (11881 = 109²).

The spelling of 22011661 in words is "twenty-two million, eleven thousand, six hundred sixty-one".