21750083 has 2 divisors, whose sum is σ = 21750084. Its totient is φ = 21750082.

The previous prime is 21750077. The next prime is 21750097. The reversal of 21750083 is 38005712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21750083 - 2¹⁰ = 21749059 is a prime.

It is a super-2 number, since 2×21750083² = 946132221013778, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21750073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10875041 + 10875042.

It is an arithmetic number, because the mean of its divisors is an integer number (10875042).

Almost surely, 2^21750083 is an apocalyptic number.

21750083 is a deficient number, since it is larger than the sum of its proper divisors (1).

21750083 is an equidigital number, since it uses as much as digits as its factorization.

21750083 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 21750083 is about 4663.6984250700. The cubic root of 21750083 is about 279.1388636552.

Adding to 21750083 its reverse (38005712), we get a palindrome (59755795).

The spelling of 21750083 in words is "twenty-one million, seven hundred fifty thousand, eighty-three".