21071730127 has 8 divisors (see below), whose sum is σ = 24082855200. Its totient is φ = 18060824544.

The previous prime is 21071730083. The next prime is 21071730131. The reversal of 21071730127 is 72103717012.

It is a happy number.

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

It is not a de Polignac number, because 21071730127 - 2¹⁹ = 21071205839 is a prime.

It is a super-2 number, since 2×21071730127² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21071730137) 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, 352149 + ... + 407617.

It is an arithmetic number, because the mean of its divisors is an integer number (3010356900).

Almost surely, 2^21071730127 is an apocalyptic number.

21071730127 is a deficient number, since it is larger than the sum of its proper divisors (3011125073).

21071730127 is an equidigital number, since it uses as much as digits as its factorization.

21071730127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109745.

The product of its (nonzero) digits is 4116, while the sum is 31.

The spelling of 21071730127 in words is "twenty-one billion, seventy-one million, seven hundred thirty thousand, one hundred twenty-seven".