21382731067 has 2 divisors, whose sum is σ = 21382731068. Its totient is φ = 21382731066.

The previous prime is 21382731059. The next prime is 21382731079. The reversal of 21382731067 is 76013728312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21382731067 - 2³ = 21382731059 is a prime.

It is not a weakly prime, because it can be changed into another prime (21382731017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10691365533 + 10691365534.

It is an arithmetic number, because the mean of its divisors is an integer number (10691365534).

Almost surely, 2^21382731067 is an apocalyptic number.

21382731067 is a deficient number, since it is larger than the sum of its proper divisors (1).

21382731067 is an equidigital number, since it uses as much as digits as its factorization.

21382731067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 40.

The spelling of 21382731067 in words is "twenty-one billion, three hundred eighty-two million, seven hundred thirty-one thousand, sixty-seven".