21343607 has 2 divisors, whose sum is σ = 21343608. Its totient is φ = 21343606.

The previous prime is 21343603. The next prime is 21343613. The reversal of 21343607 is 70634312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21343607 - 2² = 21343603 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21343601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671803 + 10671804.

It is an arithmetic number, because the mean of its divisors is an integer number (10671804).

Almost surely, 2^21343607 is an apocalyptic number.

21343607 is a deficient number, since it is larger than the sum of its proper divisors (1).

21343607 is an equidigital number, since it uses as much as digits as its factorization.

21343607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 21343607 is about 4619.9141766920. The cubic root of 21343607 is about 277.3890236117.

Adding to 21343607 its reverse (70634312), we get a palindrome (91977919).

The spelling of 21343607 in words is "twenty-one million, three hundred forty-three thousand, six hundred seven".