21983837 has 4 divisors (see below), whose sum is σ = 22939680. Its totient is φ = 21027996.

The previous prime is 21983807. The next prime is 21983861. The reversal of 21983837 is 73838912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21983837 - 2¹⁶ = 21918301 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21983794 and 21983803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21983807) 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, 477887 + ... + 477932.

It is an arithmetic number, because the mean of its divisors is an integer number (5734920).

Almost surely, 2^21983837 is an apocalyptic number.

It is an amenable number.

21983837 is a deficient number, since it is larger than the sum of its proper divisors (955843).

21983837 is an equidigital number, since it uses as much as digits as its factorization.

21983837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955842.

The product of its digits is 72576, while the sum is 41.

The square root of 21983837 is about 4688.6924616571. The cubic root of 21983837 is about 280.1352960090.

The spelling of 21983837 in words is "twenty-one million, nine hundred eighty-three thousand, eight hundred thirty-seven".