22021146 has 48 divisors (see below), whose sum is σ = 56556864. Its totient is φ = 6290784.

The previous prime is 22021123. The next prime is 22021151. The reversal of 22021146 is 64112022.

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

It is a Curzon number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 166 + ... + 6638.

It is an arithmetic number, because the mean of its divisors is an integer number (1178268).

Almost surely, 2^22021146 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22021146, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28278432).

22021146 is an abundant number, since it is smaller than the sum of its proper divisors (34535718).

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

22021146 is an equidigital number, since it uses as much as digits as its factorization.

22021146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6497 (or 6485 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 22021146 is about 4692.6693895905. The cubic root of 22021146 is about 280.2936799593.

Adding to 22021146 its reverse (64112022), we get a palindrome (86133168).

The spelling of 22021146 in words is "twenty-two million, twenty-one thousand, one hundred forty-six".