21983747 has 2 divisors, whose sum is σ = 21983748. Its totient is φ = 21983746.

The previous prime is 21983701. The next prime is 21983807. The reversal of 21983747 is 74738912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21983747 - 2⁶ = 21983683 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21983047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10991873 + 10991874.

It is an arithmetic number, because the mean of its divisors is an integer number (10991874).

Almost surely, 2^21983747 is an apocalyptic number.

21983747 is a deficient number, since it is larger than the sum of its proper divisors (1).

21983747 is an equidigital number, since it uses as much as digits as its factorization.

21983747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 41.

The square root of 21983747 is about 4688.6828640888. The cubic root of 21983747 is about 280.1349137249.

The spelling of 21983747 in words is "twenty-one million, nine hundred eighty-three thousand, seven hundred forty-seven".