21310607 has 2 divisors, whose sum is σ = 21310608. Its totient is φ = 21310606.

The previous prime is 21310603. The next prime is 21310613. The reversal of 21310607 is 70601312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21310607 - 2² = 21310603 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21310603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655303 + 10655304.

It is an arithmetic number, because the mean of its divisors is an integer number (10655304).

Almost surely, 2^21310607 is an apocalyptic number.

21310607 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310607 is an equidigital number, since it uses as much as digits as its factorization.

21310607 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 21310607 is about 4616.3413002073. The cubic root of 21310607 is about 277.2459900012.

Adding to 21310607 its reverse (70601312), we get a palindrome (91911919).

The spelling of 21310607 in words is "twenty-one million, three hundred ten thousand, six hundred seven".