21108127371 has 16 divisors (see below), whose sum is σ = 28845324288. Its totient is φ = 13723640000.

The previous prime is 21108127363. The next prime is 21108127393. The reversal of 21108127371 is 17372180112.

It is a cyclic number.

It is not a de Polignac number, because 21108127371 - 2³ = 21108127363 is a prime.

It is a super-2 number, since 2×21108127371² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21108123371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226755 + ... + 305996.

It is an arithmetic number, because the mean of its divisors is an integer number (1802832768).

Almost surely, 2^21108127371 is an apocalyptic number.

21108127371 is a deficient number, since it is larger than the sum of its proper divisors (7737196917).

21108127371 is a wasteful number, since it uses less digits than its factorization.

21108127371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533082.

The product of its (nonzero) digits is 4704, while the sum is 33.

The spelling of 21108127371 in words is "twenty-one billion, one hundred eight million, one hundred twenty-seven thousand, three hundred seventy-one".