21161695 has 8 divisors (see below), whose sum is σ = 25418736. Its totient is φ = 16912896.

The previous prime is 21161683. The next prime is 21161717. The reversal of 21161695 is 59616112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21161695 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8959 + ... + 11071.

It is an arithmetic number, because the mean of its divisors is an integer number (3177342).

Almost surely, 2^21161695 is an apocalyptic number.

21161695 is a deficient number, since it is larger than the sum of its proper divisors (4257041).

21161695 is a wasteful number, since it uses less digits than its factorization.

21161695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4121.

The product of its digits is 3240, while the sum is 31.

The square root of 21161695 is about 4600.1842354410. The cubic root of 21161695 is about 276.5987099428.

The spelling of 21161695 in words is "twenty-one million, one hundred sixty-one thousand, six hundred ninety-five".