21102983 has 16 divisors (see below), whose sum is σ = 24192000. Its totient is φ = 18221280.

The previous prime is 21102979. The next prime is 21103003. The reversal of 21102983 is 38920112.

It is not a de Polignac number, because 21102983 - 2² = 21102979 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60293 + ... + 60641.

It is an arithmetic number, because the mean of its divisors is an integer number (1512000).

Almost surely, 2^21102983 is an apocalyptic number.

21102983 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21102983 is a deficient number, since it is larger than the sum of its proper divisors (3089017).

21102983 is a wasteful number, since it uses less digits than its factorization.

21102983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 21102983 is about 4593.7983194738. The cubic root of 21102983 is about 276.3426701920.

It can be divided in two parts, 211029 and 83, that added together give a palindrome (211112).

The spelling of 21102983 in words is "twenty-one million, one hundred two thousand, nine hundred eighty-three".