21921126 has 16 divisors (see below), whose sum is σ = 46421424. Its totient is φ = 6877184.

The previous prime is 21921121. The next prime is 21921167. The reversal of 21921126 is 62112912.

It is a junction number, because it is equal to n+sod(n) for n = 21921096 and 21921105.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 107355 + ... + 107558.

It is an arithmetic number, because the mean of its divisors is an integer number (2901339).

Almost surely, 2^21921126 is an apocalyptic number.

21921126 is an abundant number, since it is smaller than the sum of its proper divisors (24500298).

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

21921126 is a wasteful number, since it uses less digits than its factorization.

21921126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214935.

The product of its digits is 432, while the sum is 24.

The square root of 21921126 is about 4682.0002135839. Note that the first 3 decimals coincide. The cubic root of 21921126 is about 279.8686714057.

The spelling of 21921126 in words is "twenty-one million, nine hundred twenty-one thousand, one hundred twenty-six".