21500245517727 has 8 divisors (see below), whose sum is σ = 28668984706480. Its totient is φ = 14332501670400.

The previous prime is 21500245517701. The next prime is 21500245517743. The reversal of 21500245517727 is 72771554200512.

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

It is not a de Polignac number, because 21500245517727 - 2¹⁵ = 21500245484959 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 (21500245512727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248784952 + ... + 248871357.

It is an arithmetic number, because the mean of its divisors is an integer number (3583623088310).

Almost surely, 2^{21500245517727} is an apocalyptic number.

21500245517727 is a deficient number, since it is larger than the sum of its proper divisors (7168739188753).

21500245517727 is a wasteful number, since it uses less digits than its factorization.

21500245517727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497670713.

The product of its (nonzero) digits is 1372000, while the sum is 48.

The spelling of 21500245517727 in words is "twenty-one trillion, five hundred billion, two hundred forty-five million, five hundred seventeen thousand, seven hundred twenty-seven".