21507531773363 has 2 divisors, whose sum is σ = 21507531773364. Its totient is φ = 21507531773362.

The previous prime is 21507531773353. The next prime is 21507531773411. The reversal of 21507531773363 is 36337713570512.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21507531773363 is a prime.

It is not a weakly prime, because it can be changed into another prime (21507531773353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10753765886681 + 10753765886682.

It is an arithmetic number, because the mean of its divisors is an integer number (10753765886682).

Almost surely, 2^{21507531773363} is an apocalyptic number.

21507531773363 is a deficient number, since it is larger than the sum of its proper divisors (1).

21507531773363 is an equidigital number, since it uses as much as digits as its factorization.

21507531773363 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8334900, while the sum is 53.

The spelling of 21507531773363 in words is "twenty-one trillion, five hundred seven billion, five hundred thirty-one million, seven hundred seventy-three thousand, three hundred sixty-three".