21367607 has 2 divisors, whose sum is σ = 21367608. Its totient is φ = 21367606.

The previous prime is 21367583. The next prime is 21367613. The reversal of 21367607 is 70676312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21367607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21367807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10683803 + 10683804.

It is an arithmetic number, because the mean of its divisors is an integer number (10683804).

Almost surely, 2^21367607 is an apocalyptic number.

21367607 is a deficient number, since it is larger than the sum of its proper divisors (1).

21367607 is an equidigital number, since it uses as much as digits as its factorization.

21367607 is an evil number, because the sum of its binary digits is even.

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

The square root of 21367607 is about 4622.5108977697. The cubic root of 21367607 is about 277.4929554795.

The spelling of 21367607 in words is "twenty-one million, three hundred sixty-seven thousand, six hundred seven".