21983807 has 2 divisors, whose sum is σ = 21983808. Its totient is φ = 21983806.

The previous prime is 21983747. The next prime is 21983861. The reversal of 21983807 is 70838912.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21983807 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21983887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10991903 + 10991904.

It is an arithmetic number, because the mean of its divisors is an integer number (10991904).

Almost surely, 2^21983807 is an apocalyptic number.

21983807 is a deficient number, since it is larger than the sum of its proper divisors (1).

21983807 is an equidigital number, since it uses as much as digits as its factorization.

21983807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 21983807 is about 4688.6892624698. The cubic root of 21983807 is about 280.1351685811.

The spelling of 21983807 in words is "twenty-one million, nine hundred eighty-three thousand, eight hundred seven".