21177422105 has 16 divisors (see below), whose sum is σ = 29221509504. Its totient is φ = 14432567040.

The previous prime is 21177422093. The next prime is 21177422143. The reversal of 21177422105 is 50122477112.

It is not a de Polignac number, because 21177422105 - 2¹⁰ = 21177421081 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 1850336 + ... + 1861745.

It is an arithmetic number, because the mean of its divisors is an integer number (1826344344).

Almost surely, 2^21177422105 is an apocalyptic number.

It is an amenable number.

21177422105 is a deficient number, since it is larger than the sum of its proper divisors (8044087399).

21177422105 is a wasteful number, since it uses less digits than its factorization.

21177422105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3712256.

The product of its (nonzero) digits is 7840, while the sum is 32.

Adding to 21177422105 its reverse (50122477112), we get a palindrome (71299899217).

The spelling of 21177422105 in words is "twenty-one billion, one hundred seventy-seven million, four hundred twenty-two thousand, one hundred five".