21269222 has 16 divisors (see below), whose sum is σ = 34529712. Its totient is φ = 9767520.

The previous prime is 21269197. The next prime is 21269233. The reversal of 21269222 is 22296212.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 21269191 and 21269200.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3548 + ... + 7424.

It is an arithmetic number, because the mean of its divisors is an integer number (2158107).

Almost surely, 2^21269222 is an apocalyptic number.

21269222 is a deficient number, since it is larger than the sum of its proper divisors (13260490).

21269222 is a wasteful number, since it uses less digits than its factorization.

21269222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4103.

The product of its digits is 1728, while the sum is 26.

The square root of 21269222 is about 4611.8566760037. The cubic root of 21269222 is about 277.0664039908.

The spelling of 21269222 in words is "twenty-one million, two hundred sixty-nine thousand, two hundred twenty-two".