21150023046409 has 2 divisors, whose sum is σ = 21150023046410. Its totient is φ = 21150023046408.

The previous prime is 21150023046371. The next prime is 21150023046469. The reversal of 21150023046409 is 90464032005112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21143029404025 + 6993642384 = 4598155^2 + 83628^2 .

It is a cyclic number.

It is not a de Polignac number, because 21150023046409 - 2¹⁹ = 21150022522121 is a prime.

It is not a weakly prime, because it can be changed into another prime (21150023046469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10575011523204 + 10575011523205.

It is an arithmetic number, because the mean of its divisors is an integer number (10575011523205).

Almost surely, 2^{21150023046409} is an apocalyptic number.

It is an amenable number.

21150023046409 is a deficient number, since it is larger than the sum of its proper divisors (1).

21150023046409 is an equidigital number, since it uses as much as digits as its factorization.

21150023046409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 21150023046409 in words is "twenty-one trillion, one hundred fifty billion, twenty-three million, forty-six thousand, four hundred nine".