21776071161 has 32 divisors (see below), whose sum is σ = 31966437888. Its totient is φ = 13102007040.

The previous prime is 21776071159. The next prime is 21776071243. The reversal of 21776071161 is 16117067712.

It is not a de Polignac number, because 21776071161 - 2¹ = 21776071159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (21776071111) 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, 1939215 + ... + 1950411.

It is an arithmetic number, because the mean of its divisors is an integer number (998951184).

Almost surely, 2^21776071161 is an apocalyptic number.

It is an amenable number.

21776071161 is a deficient number, since it is larger than the sum of its proper divisors (10190366727).

21776071161 is a wasteful number, since it uses less digits than its factorization.

21776071161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12321.

The product of its (nonzero) digits is 24696, while the sum is 39.

The spelling of 21776071161 in words is "twenty-one billion, seven hundred seventy-six million, seventy-one thousand, one hundred sixty-one".