22021011 has 16 divisors (see below), whose sum is σ = 32696320. Its totient is φ = 14648040.

The previous prime is 22021009. The next prime is 22021049. The reversal of 22021011 is 11012022.

It is not a de Polignac number, because 22021011 - 2¹ = 22021009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22020984 and 22021002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21726 + ... + 22716.

It is an arithmetic number, because the mean of its divisors is an integer number (2043520).

Almost surely, 2^22021011 is an apocalyptic number.

22021011 is a deficient number, since it is larger than the sum of its proper divisors (10675309).

22021011 is an equidigital number, since it uses as much as digits as its factorization.

22021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823 (or 1817 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 22021011 is about 4692.6550054314. The cubic root of 22021011 is about 280.2931071807.

Adding to 22021011 its reverse (11012022), we get a palindrome (33033033).

It can be divided in two parts, 2202 and 1011, that multiplied together give a palindrome (2226222).

The spelling of 22021011 in words is "twenty-two million, twenty-one thousand, eleven".