22021047 has 12 divisors (see below), whose sum is σ = 31858840. Its totient is φ = 14657328.

The previous prime is 22021009. The next prime is 22021049. The reversal of 22021047 is 74012022.

It is not a de Polignac number, because 22021047 - 2¹⁰ = 22020023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5529 + ... + 8637.

Almost surely, 2^22021047 is an apocalyptic number.

22021047 is a deficient number, since it is larger than the sum of its proper divisors (9837793).

22021047 is a wasteful number, since it uses less digits than its factorization.

22021047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3902 (or 3899 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 22021047 is about 4692.6588412115. The cubic root of 22021047 is about 280.2932599218.

Adding to 22021047 its reverse (74012022), we get a palindrome (96033069).

It can be divided in two parts, 2202 and 1047, that added together give a square (3249 = 57²).

The spelling of 22021047 in words is "twenty-two million, twenty-one thousand, forty-seven".