21909122 has 8 divisors (see below), whose sum is σ = 33189372. Its totient is φ = 10846000.

The previous prime is 21909103. The next prime is 21909131. The reversal of 21909122 is 22190912.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21799561 + 109561 = 4669^2 + 331^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21909091 and 21909100.

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 3 ways as a sum of consecutive naturals, for example, 54029 + ... + 54432.

Almost surely, 2^21909122 is an apocalyptic number.

21909122 is a deficient number, since it is larger than the sum of its proper divisors (11280250).

21909122 is a wasteful number, since it uses less digits than its factorization.

21909122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108564.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 21909122 is about 4680.7181072993. The cubic root of 21909122 is about 279.8175767532.

The spelling of 21909122 in words is "twenty-one million, nine hundred nine thousand, one hundred twenty-two".