21506247517301 has 8 divisors (see below), whose sum is σ = 21591927751680. Its totient is φ = 21420609737968.

The previous prime is 21506247517283. The next prime is 21506247517357. The reversal of 21506247517301 is 10371574260512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21506247517301 - 2¹⁰ = 21506247516277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21506247517201) 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 7 ways as a sum of consecutive naturals, for example, 9598421 + ... + 11625066.

It is an arithmetic number, because the mean of its divisors is an integer number (2698990968960).

Almost surely, 2^{21506247517301} is an apocalyptic number.

It is an amenable number.

21506247517301 is a deficient number, since it is larger than the sum of its proper divisors (85680234379).

21506247517301 is a wasteful number, since it uses less digits than its factorization.

21506247517301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21227523.

The product of its (nonzero) digits is 352800, while the sum is 44.

The spelling of 21506247517301 in words is "twenty-one trillion, five hundred six billion, two hundred forty-seven million, five hundred seventeen thousand, three hundred one".