21077161 has 16 divisors (see below), whose sum is σ = 26199936. Its totient is φ = 16540416.

The previous prime is 21077129. The next prime is 21077167. The reversal of 21077161 is 16177012.

It is a cyclic number.

It is not a de Polignac number, because 21077161 - 2⁵ = 21077129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21077167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2010 + ... + 6796.

It is an arithmetic number, because the mean of its divisors is an integer number (1637496).

Almost surely, 2^21077161 is an apocalyptic number.

It is an amenable number.

21077161 is a deficient number, since it is larger than the sum of its proper divisors (5122775).

21077161 is a wasteful number, since it uses less digits than its factorization.

21077161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4848.

The product of its (nonzero) digits is 588, while the sum is 25.

The square root of 21077161 is about 4590.9869309333. The cubic root of 21077161 is about 276.2299115222.

The spelling of 21077161 in words is "twenty-one million, seventy-seven thousand, one hundred sixty-one".