22021554 has 8 divisors (see below), whose sum is σ = 44043120. Its totient is φ = 7340516.

The previous prime is 22021543. The next prime is 22021561. The reversal of 22021554 is 45512022.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

22021554 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 22021554.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1835124 + ... + 1835135.

It is an arithmetic number, because the mean of its divisors is an integer number (5505390).

Almost surely, 2^22021554 is an apocalyptic number.

22021554 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

22021554 is a wasteful number, since it uses less digits than its factorization.

22021554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3670264.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 22021554 is about 4692.7128614481. The cubic root of 22021554 is about 280.2954110093.

Adding to 22021554 its reverse (45512022), we get a palindrome (67533576).

The spelling of 22021554 in words is "twenty-two million, twenty-one thousand, five hundred fifty-four".