21170373 has 32 divisors (see below), whose sum is σ = 34338816. Its totient is φ = 11339328.

The previous prime is 21170353. The next prime is 21170393. The reversal of 21170373 is 37307112.

It is an interprime number because it is at equal distance from previous prime (21170353) and next prime (21170393).

It is a de Polignac number, because none of the positive numbers 2^k-21170373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21170323) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25186 + ... + 26012.

It is an arithmetic number, because the mean of its divisors is an integer number (1073088).

Almost surely, 2^21170373 is an apocalyptic number.

21170373 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21170373 is a deficient number, since it is larger than the sum of its proper divisors (13168443).

21170373 is a wasteful number, since it uses less digits than its factorization.

21170373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913.

The product of its (nonzero) digits is 882, while the sum is 24.

The square root of 21170373 is about 4601.1273618538. The cubic root of 21170373 is about 276.6365140282.

Adding to 21170373 its reverse (37307112), we get a palindrome (58477485).

The spelling of 21170373 in words is "twenty-one million, one hundred seventy thousand, three hundred seventy-three".