21033667161 has 24 divisors (see below), whose sum is σ = 32912672520. Its totient is φ = 12943783008.

The previous prime is 21033667133. The next prime is 21033667169. The reversal of 21033667161 is 16176633012.

It can be written as a sum of positive squares in 4 ways, for example, as 2276721225 + 18756945936 = 47715^2 + 136956^2 .

It is not a de Polignac number, because 21033667161 - 2¹⁴ = 21033650777 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21033667169) 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 23 ways as a sum of consecutive naturals, for example, 512106 + ... + 551651.

It is an arithmetic number, because the mean of its divisors is an integer number (1371361355).

Almost surely, 2^21033667161 is an apocalyptic number.

It is an amenable number.

21033667161 is a deficient number, since it is larger than the sum of its proper divisors (11879005359).

21033667161 is a wasteful number, since it uses less digits than its factorization.

21033667161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063802 (or 1063773 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The spelling of 21033667161 in words is "twenty-one billion, thirty-three million, six hundred sixty-seven thousand, one hundred sixty-one".