19527632921 has 2 divisors, whose sum is σ = 19527632922. Its totient is φ = 19527632920.

The previous prime is 19527632899. The next prime is 19527632963. The reversal of 19527632921 is 12923672591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19286265625 + 241367296 = 138875^2 + 15536^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19527632921 is a prime.

It is not a weakly prime, because it can be changed into another prime (19527635921) 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, 9763816460 + 9763816461.

It is an arithmetic number, because the mean of its divisors is an integer number (9763816461).

Almost surely, 2^19527632921 is an apocalyptic number.

It is an amenable number.

19527632921 is a deficient number, since it is larger than the sum of its proper divisors (1).

19527632921 is an equidigital number, since it uses as much as digits as its factorization.

19527632921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 47.

The spelling of 19527632921 in words is "nineteen billion, five hundred twenty-seven million, six hundred thirty-two thousand, nine hundred twenty-one".