21506071547363 has 24 divisors (see below), whose sum is σ = 24128492169600. Its totient is φ = 19167213313248.

The previous prime is 21506071547357. The next prime is 21506071547399. The reversal of 21506071547363 is 36374517060512.

It is not a de Polignac number, because 21506071547363 - 2¹² = 21506071543267 is a prime.

It is a super-2 number, since 2×21506071547363² (a number of 27 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21506071547263) 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 in 23 ways as a sum of consecutive naturals, for example, 3972083 + ... + 7667436.

It is an arithmetic number, because the mean of its divisors is an integer number (1005353840400).

Almost surely, 2^{21506071547363} is an apocalyptic number.

21506071547363 is a deficient number, since it is larger than the sum of its proper divisors (2622420622237).

21506071547363 is an equidigital number, since it uses as much as digits as its factorization.

21506071547363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11639616 (or 11639561 counting only the distinct ones).

The product of its (nonzero) digits is 3175200, while the sum is 50.

The spelling of 21506071547363 in words is "twenty-one trillion, five hundred six billion, seventy-one million, five hundred forty-seven thousand, three hundred sixty-three".