21036767 has 2 divisors, whose sum is σ = 21036768. Its totient is φ = 21036766.

The previous prime is 21036751. The next prime is 21036787. The reversal of 21036767 is 76763012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21036767 - 2⁴ = 21036751 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21036737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10518383 + 10518384.

It is an arithmetic number, because the mean of its divisors is an integer number (10518384).

Almost surely, 2^21036767 is an apocalyptic number.

21036767 is a deficient number, since it is larger than the sum of its proper divisors (1).

21036767 is an equidigital number, since it uses as much as digits as its factorization.

21036767 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 21036767 is about 4586.5855491858. The cubic root of 21036767 is about 276.0533354533.

Adding to 21036767 its reverse (76763012), we get a palindrome (97799779).

The spelling of 21036767 in words is "twenty-one million, thirty-six thousand, seven hundred sixty-seven".