21703667 has 2 divisors, whose sum is σ = 21703668. Its totient is φ = 21703666.

The previous prime is 21703663. The next prime is 21703699. The reversal of 21703667 is 76630712.

It is an a-pointer prime, because the next prime (21703699) can be obtained adding 21703667 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21703667 - 2² = 21703663 is a prime.

It is a super-2 number, since 2×21703667² = 942098322493778, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21703663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10851833 + 10851834.

It is an arithmetic number, because the mean of its divisors is an integer number (10851834).

Almost surely, 2^21703667 is an apocalyptic number.

21703667 is a deficient number, since it is larger than the sum of its proper divisors (1).

21703667 is an equidigital number, since it uses as much as digits as its factorization.

21703667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 21703667 is about 4658.7194592506. The cubic root of 21703667 is about 278.9401557990.

The spelling of 21703667 in words is "twenty-one million, seven hundred three thousand, six hundred sixty-seven".