22212021 has 16 divisors (see below), whose sum is σ = 32215680. Its totient is φ = 13531200.

The previous prime is 22212019. The next prime is 22212049. The reversal of 22212021 is 12021222.

It is not a de Polignac number, because 22212021 - 2¹ = 22212019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22211988 and 22212006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22212821) 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, 1120 + ... + 6758.

It is an arithmetic number, because the mean of its divisors is an integer number (2013480).

Almost surely, 2^22212021 is an apocalyptic number.

It is an amenable number.

22212021 is a deficient number, since it is larger than the sum of its proper divisors (10003659).

22212021 is a wasteful number, since it uses less digits than its factorization.

22212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5756.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 22212021 is about 4712.9630806956. The cubic root of 22212021 is about 281.1011949624.

Adding to 22212021 its reverse (12021222), we get a palindrome (34233243).

It can be divided in two parts, 222 and 12021, that multiplied together give a palindrome (2668662).

The spelling of 22212021 in words is "twenty-two million, two hundred twelve thousand, twenty-one".