21043029937 has 2 divisors, whose sum is σ = 21043029938. Its totient is φ = 21043029936.

The previous prime is 21043029907. The next prime is 21043029979. The reversal of 21043029937 is 73992034012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19908081216 + 1134948721 = 141096^2 + 33689^2 .

It is a cyclic number.

It is not a de Polignac number, because 21043029937 - 2²⁷ = 20908812209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21043029937.

It is not a weakly prime, because it can be changed into another prime (21043029907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10521514968 + 10521514969.

It is an arithmetic number, because the mean of its divisors is an integer number (10521514969).

Almost surely, 2^21043029937 is an apocalyptic number.

It is an amenable number.

21043029937 is a deficient number, since it is larger than the sum of its proper divisors (1).

21043029937 is an equidigital number, since it uses as much as digits as its factorization.

21043029937 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 40.

The spelling of 21043029937 in words is "twenty-one billion, forty-three million, twenty-nine thousand, nine hundred thirty-seven".