21086349 has 8 divisors (see below), whose sum is σ = 28167840. Its totient is φ = 14031216.

The previous prime is 21086347. The next prime is 21086381. The reversal of 21086349 is 94368012.

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

It is not a de Polignac number, because 21086349 - 2¹ = 21086347 is a prime.

It is a super-2 number, since 2×21086349² = 889268228299602, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21086347) 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, 4639 + ... + 7980.

It is an arithmetic number, because the mean of its divisors is an integer number (3520980).

Almost surely, 2^21086349 is an apocalyptic number.

It is an amenable number.

21086349 is a deficient number, since it is larger than the sum of its proper divisors (7081491).

21086349 is a wasteful number, since it uses less digits than its factorization.

21086349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13179.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 21086349 is about 4591.9874782059. The cubic root of 21086349 is about 276.2700439310.

The spelling of 21086349 in words is "twenty-one million, eighty-six thousand, three hundred forty-nine".