21422707 has 2 divisors, whose sum is σ = 21422708. Its totient is φ = 21422706.

The previous prime is 21422693. The next prime is 21422711. The reversal of 21422707 is 70722412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21422707 - 2⁷ = 21422579 is a prime.

It is not a weakly prime, because it can be changed into another prime (21422717) 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, 10711353 + 10711354.

It is an arithmetic number, because the mean of its divisors is an integer number (10711354).

Almost surely, 2^21422707 is an apocalyptic number.

21422707 is a deficient number, since it is larger than the sum of its proper divisors (1).

21422707 is an equidigital number, since it uses as much as digits as its factorization.

21422707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 21422707 is about 4628.4670248366. The cubic root of 21422707 is about 277.7312716395.

The spelling of 21422707 in words is "twenty-one million, four hundred twenty-two thousand, seven hundred seven".