21083188 has 24 divisors (see below), whose sum is σ = 42964992. Its totient is φ = 8864544.

The previous prime is 21083177. The next prime is 21083189. The reversal of 21083188 is 88138012.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21083189) 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, 5620 + ... + 8587.

It is an arithmetic number, because the mean of its divisors is an integer number (1790208).

Almost surely, 2^21083188 is an apocalyptic number.

21083188 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21083188 is an abundant number, since it is smaller than the sum of its proper divisors (21881804).

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

21083188 is a wasteful number, since it uses less digits than its factorization.

21083188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14271 (or 14269 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 21083188 is about 4591.6432788273. The cubic root of 21083188 is about 276.2562382654.

The spelling of 21083188 in words is "twenty-one million, eighty-three thousand, one hundred eighty-eight".