21753107 has 2 divisors, whose sum is σ = 21753108. Its totient is φ = 21753106.

The previous prime is 21753079. The next prime is 21753131. The reversal of 21753107 is 70135712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21753107 - 2⁸ = 21752851 is a prime.

It is not a weakly prime, because it can be changed into another prime (21753167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10876553 + 10876554.

It is an arithmetic number, because the mean of its divisors is an integer number (10876554).

Almost surely, 2^21753107 is an apocalyptic number.

21753107 is a deficient number, since it is larger than the sum of its proper divisors (1).

21753107 is an equidigital number, since it uses as much as digits as its factorization.

21753107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1470, while the sum is 26.

The square root of 21753107 is about 4664.0226200138. The cubic root of 21753107 is about 279.1517996489.

Adding to 21753107 its reverse (70135712), we get a palindrome (91888819).

The spelling of 21753107 in words is "twenty-one million, seven hundred fifty-three thousand, one hundred seven".