21679141 has 8 divisors (see below), whose sum is σ = 23683968. Its totient is φ = 19680000.

The previous prime is 21679139. The next prime is 21679159. The reversal of 21679141 is 14197612.

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

It is a cyclic number.

It is not a de Polignac number, because 21679141 - 2¹ = 21679139 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21679241) 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 7 ways as a sum of consecutive naturals, for example, 12741 + ... + 14341.

It is an arithmetic number, because the mean of its divisors is an integer number (2960496).

Almost surely, 2^21679141 is an apocalyptic number.

It is an amenable number.

21679141 is a deficient number, since it is larger than the sum of its proper divisors (2004827).

21679141 is a wasteful number, since it uses less digits than its factorization.

21679141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2843.

The product of its digits is 3024, while the sum is 31.

The square root of 21679141 is about 4656.0864467920. The cubic root of 21679141 is about 278.8350450688.

The spelling of 21679141 in words is "twenty-one million, six hundred seventy-nine thousand, one hundred forty-one".