21902083 has 4 divisors (see below), whose sum is σ = 25030960. Its totient is φ = 18773208.

The previous prime is 21902063. The next prime is 21902087. The reversal of 21902083 is 38020912.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21902083 - 2⁵ = 21902051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21902087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1564428 + ... + 1564441.

It is an arithmetic number, because the mean of its divisors is an integer number (6257740).

Almost surely, 2^21902083 is an apocalyptic number.

21902083 is a deficient number, since it is larger than the sum of its proper divisors (3128877).

21902083 is an equidigital number, since it uses as much as digits as its factorization.

21902083 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3128876.

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

The square root of 21902083 is about 4679.9661323561. The cubic root of 21902083 is about 279.7876067876.

Adding to 21902083 its reverse (38020912), we get a palindrome (59922995).

The spelling of 21902083 in words is "twenty-one million, nine hundred two thousand, eighty-three".