21083902 has 8 divisors (see below), whose sum is σ = 36143856. Its totient is φ = 9035952.

The previous prime is 21083897. The next prime is 21083903. The reversal of 21083902 is 20938012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21083903) 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, 752983 + ... + 753010.

It is an arithmetic number, because the mean of its divisors is an integer number (4517982).

Almost surely, 2^21083902 is an apocalyptic number.

21083902 is a deficient number, since it is larger than the sum of its proper divisors (15059954).

21083902 is a wasteful number, since it uses less digits than its factorization.

21083902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1506002.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 21083902 is about 4591.7210281114. The cubic root of 21083902 is about 276.2593567806.

The spelling of 21083902 in words is "twenty-one million, eighty-three thousand, nine hundred two".