22011021 has 20 divisors (see below), whose sum is σ = 33008800. Its totient is φ = 14616936.

The previous prime is 22011001. The next prime is 22011037. The reversal of 22011021 is 12011022.

It is not a de Polignac number, because 22011021 - 2⁶ = 22010957 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 = 22010994 and 22011012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22011001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 35250 + ... + 35868.

It is an arithmetic number, because the mean of its divisors is an integer number (1650440).

Almost surely, 2^22011021 is an apocalyptic number.

It is an amenable number.

22011021 is a deficient number, since it is larger than the sum of its proper divisors (10997779).

22011021 is an equidigital number, since it uses as much as digits as its factorization.

22011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070 (or 1061 counting only the distinct ones).

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

The square root of 22011021 is about 4691.5904552721. The cubic root of 22011021 is about 280.2507150658.

Adding to 22011021 its reverse (12011022), we get a palindrome (34022043).

Subtracting from 22011021 its reverse (12011022), we obtain a palindrome (9999999).

The spelling of 22011021 in words is "twenty-two million, eleven thousand, twenty-one".