21086373 has 16 divisors (see below), whose sum is σ = 35053056. Its totient is φ = 10953840.

The previous prime is 21086347. The next prime is 21086381. The reversal of 21086373 is 37368012.

It is not a de Polignac number, because 21086373 - 2¹² = 21082277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21086373.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21086473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45411 + ... + 45872.

It is an arithmetic number, because the mean of its divisors is an integer number (2190816).

Almost surely, 2^21086373 is an apocalyptic number.

It is an amenable number.

21086373 is a deficient number, since it is larger than the sum of its proper divisors (13966683).

21086373 is a wasteful number, since it uses less digits than its factorization.

21086373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91304.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 21086373 is about 4591.9900914527. The cubic root of 21086373 is about 276.2701487457.

The spelling of 21086373 in words is "twenty-one million, eighty-six thousand, three hundred seventy-three".