21921122 has 8 divisors (see below), whose sum is σ = 32916672. Its totient is φ = 10948900.

The previous prime is 21921121. The next prime is 21921167. The reversal of 21921122 is 22112912.

It is a happy number.

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 = 21921094 and 21921103.

It is not an unprimeable number, because it can be changed into a prime (21921121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3254 + ... + 7377.

It is an arithmetic number, because the mean of its divisors is an integer number (4114584).

Almost surely, 2^21921122 is an apocalyptic number.

21921122 is a deficient number, since it is larger than the sum of its proper divisors (10995550).

21921122 is a wasteful number, since it uses less digits than its factorization.

21921122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11664.

The product of its digits is 144, while the sum is 20.

The square root of 21921122 is about 4681.9997864161. Note that the first 3 decimals coincide. The cubic root of 21921122 is about 279.8686543829.

The spelling of 21921122 in words is "twenty-one million, nine hundred twenty-one thousand, one hundred twenty-two".