21930107 has 2 divisors, whose sum is σ = 21930108. Its totient is φ = 21930106.

The previous prime is 21930101. The next prime is 21930131. The reversal of 21930107 is 70103912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21930107 - 2⁸ = 21929851 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21930101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10965053 + 10965054.

It is an arithmetic number, because the mean of its divisors is an integer number (10965054).

Almost surely, 2^21930107 is an apocalyptic number.

21930107 is a deficient number, since it is larger than the sum of its proper divisors (1).

21930107 is an equidigital number, since it uses as much as digits as its factorization.

21930107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 21930107 is about 4682.9592140013. The cubic root of 21930107 is about 279.9068865557.

The spelling of 21930107 in words is "twenty-one million, nine hundred thirty thousand, one hundred seven".