22256021 has 8 divisors (see below), whose sum is σ = 23341080. Its totient is φ = 21192192.

The previous prime is 22255999. The next prime is 22256027. The reversal of 22256021 is 12065222.

It can be written as a sum of positive squares in 4 ways, for example, as 62500 + 22193521 = 250^2 + 4711^2 .

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

It is not a de Polignac number, because 22256021 - 2¹⁰ = 22254997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22255984 and 22256002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22256027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3140 + ... + 7373.

It is an arithmetic number, because the mean of its divisors is an integer number (2917635).

Almost surely, 2^22256021 is an apocalyptic number.

It is an amenable number.

22256021 is a deficient number, since it is larger than the sum of its proper divisors (1085059).

22256021 is a wasteful number, since it uses less digits than its factorization.

22256021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10615.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 22256021 is about 4717.6287475807. The cubic root of 22256021 is about 281.2866845318.

The spelling of 22256021 in words is "twenty-two million, two hundred fifty-six thousand, twenty-one".