21494186727 has 32 divisors (see below), whose sum is σ = 31280148480. Its totient is φ = 13048888320.

The previous prime is 21494186713. The next prime is 21494186731. The reversal of 21494186727 is 72768149412.

It is not a de Polignac number, because 21494186727 - 2⁷ = 21494186599 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21494186727.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21494186797) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5226402 + ... + 5230512.

It is an arithmetic number, because the mean of its divisors is an integer number (977504640).

Almost surely, 2^21494186727 is an apocalyptic number.

21494186727 is a deficient number, since it is larger than the sum of its proper divisors (9785961753).

21494186727 is a wasteful number, since it uses less digits than its factorization.

21494186727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5903.

The product of its digits is 1354752, while the sum is 51.

The spelling of 21494186727 in words is "twenty-one billion, four hundred ninety-four million, one hundred eighty-six thousand, seven hundred twenty-seven".