22021650 has 72 divisors (see below), whose sum is σ = 67626624. Its totient is φ = 5032800.

The previous prime is 22021639. The next prime is 22021651. The reversal of 22021650 is 5612022.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22021651) 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 35 ways as a sum of consecutive naturals, for example, 346 + ... + 6645.

Almost surely, 2^22021650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22021650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33813312).

22021650 is an abundant number, since it is smaller than the sum of its proper divisors (45604974).

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

22021650 is a wasteful number, since it uses less digits than its factorization.

22021650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7016 (or 7008 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 22021650 is about 4692.7230900619. The cubic root of 22021650 is about 280.2958183121.

Adding to 22021650 its reverse (5612022), we get a palindrome (27633672).

The spelling of 22021650 in words is "twenty-two million, twenty-one thousand, six hundred fifty".