21099132 has 18 divisors (see below), whose sum is σ = 53334008. Its totient is φ = 7033032.

The previous prime is 21099121. The next prime is 21099151. The reversal of 21099132 is 23199012.

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 21099096 and 21099105.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 293008 + ... + 293079.

Almost surely, 2^21099132 is an apocalyptic number.

It is an amenable number.

21099132 is an abundant number, since it is smaller than the sum of its proper divisors (32234876).

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

21099132 is a wasteful number, since it uses less digits than its factorization.

21099132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586097 (or 586092 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 21099132 is about 4593.3791482959. The cubic root of 21099132 is about 276.3258596086.

The spelling of 21099132 in words is "twenty-one million, ninety-nine thousand, one hundred thirty-two".