21122226 has 24 divisors (see below), whose sum is σ = 46517484. Its totient is φ = 6924960.

The previous prime is 21122221. The next prime is 21122251. The reversal of 21122226 is 62222112.

It can be written as a sum of positive squares in 2 ways, for example, as 15992001 + 5130225 = 3999^2 + 2265^2 .

It is a super-2 number, since 2×21122226² = 892296862390152, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21122199 and 21122208.

It is not an unprimeable number, because it can be changed into a prime (21122221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8521 + ... + 10716.

Almost surely, 2^21122226 is an apocalyptic number.

21122226 is an abundant number, since it is smaller than the sum of its proper divisors (25395258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21122226 is a wasteful number, since it uses less digits than its factorization.

21122226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19306 (or 19303 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 21122226 is about 4595.8922963882. The cubic root of 21122226 is about 276.4266400980.

Adding to 21122226 its reverse (62222112), we get a palindrome (83344338).

The spelling of 21122226 in words is "twenty-one million, one hundred twenty-two thousand, two hundred twenty-six".