21196841 has 8 divisors (see below), whose sum is σ = 22501800. Its totient is φ = 19898368.

The previous prime is 21196831. The next prime is 21196843. The reversal of 21196841 is 14869112.

It can be written as a sum of positive squares in 4 ways, for example, as 3312400 + 17884441 = 1820^2 + 4229^2 .

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-21196841 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21196798 and 21196807.

It is not an unprimeable number, because it can be changed into a prime (21196843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6245 + ... + 9021.

It is an arithmetic number, because the mean of its divisors is an integer number (2812725).

Almost surely, 2^21196841 is an apocalyptic number.

It is an amenable number.

21196841 is a deficient number, since it is larger than the sum of its proper divisors (1304959).

21196841 is a wasteful number, since it uses less digits than its factorization.

21196841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3243.

The product of its digits is 3456, while the sum is 32.

The square root of 21196841 is about 4604.0027150296. The cubic root of 21196841 is about 276.7517531558.

The spelling of 21196841 in words is "twenty-one million, one hundred ninety-six thousand, eight hundred forty-one".