21536707 has 2 divisors, whose sum is σ = 21536708. Its totient is φ = 21536706.

The previous prime is 21536699. The next prime is 21536737. The reversal of 21536707 is 70763512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21536707 - 2³ = 21536699 is a prime.

It is not a weakly prime, because it can be changed into another prime (21536737) 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, 10768353 + 10768354.

It is an arithmetic number, because the mean of its divisors is an integer number (10768354).

Almost surely, 2^21536707 is an apocalyptic number.

21536707 is a deficient number, since it is larger than the sum of its proper divisors (1).

21536707 is an equidigital number, since it uses as much as digits as its factorization.

21536707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 21536707 is about 4640.7657773260. The cubic root of 21536707 is about 278.2230452964.

The spelling of 21536707 in words is "twenty-one million, five hundred thirty-six thousand, seven hundred seven".