21450707 has 2 divisors, whose sum is σ = 21450708. Its totient is φ = 21450706.

The previous prime is 21450703. The next prime is 21450727. The reversal of 21450707 is 70705412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21450707 - 2² = 21450703 is a 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 (21450701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10725353 + 10725354.

It is an arithmetic number, because the mean of its divisors is an integer number (10725354).

Almost surely, 2^21450707 is an apocalyptic number.

21450707 is a deficient number, since it is larger than the sum of its proper divisors (1).

21450707 is an equidigital number, since it uses as much as digits as its factorization.

21450707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 21450707 is about 4631.4907967090. The cubic root of 21450707 is about 277.8522194738.

The spelling of 21450707 in words is "twenty-one million, four hundred fifty thousand, seven hundred seven".