22161630 has 16 divisors (see below), whose sum is σ = 53187984. Its totient is φ = 5909760.

The previous prime is 22161617. The next prime is 22161647. The reversal of 22161630 is 3616122.

It is a happy number.

It is a super-2 number, since 2×22161630² = 982275688513800, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22161597 and 22161606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 369331 + ... + 369390.

It is an arithmetic number, because the mean of its divisors is an integer number (3324249).

Almost surely, 2^22161630 is an apocalyptic number.

22161630 is an abundant number, since it is smaller than the sum of its proper divisors (31026354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22161630 is a wasteful number, since it uses less digits than its factorization.

22161630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738731.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 22161630 is about 4707.6140453525. The cubic root of 22161630 is about 280.8884618729. Note that the first 3 decimals are identical.

Adding to 22161630 its reverse (3616122), we get a palindrome (25777752).

It can be divided in two parts, 22161 and 630, that added together give a triangular number (22791 = T₂₁₃).

The spelling of 22161630 in words is "twenty-two million, one hundred sixty-one thousand, six hundred thirty".