21850307 has 2 divisors, whose sum is σ = 21850308. Its totient is φ = 21850306.

The previous prime is 21850277. The next prime is 21850327. The reversal of 21850307 is 70305812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21850307 - 2⁸ = 21850051 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (21850327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10925153 + 10925154.

It is an arithmetic number, because the mean of its divisors is an integer number (10925154).

Almost surely, 2^21850307 is an apocalyptic number.

21850307 is a deficient number, since it is larger than the sum of its proper divisors (1).

21850307 is an equidigital number, since it uses as much as digits as its factorization.

21850307 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 21850307 is about 4674.4311953435. The cubic root of 21850307 is about 279.5669624282.

The spelling of 21850307 in words is "twenty-one million, eight hundred fifty thousand, three hundred seven".