21107373 has 16 divisors (see below), whose sum is σ = 33202176. Its totient is φ = 11671920.

The previous prime is 21107369. The next prime is 21107381. The reversal of 21107373 is 37370112.

It is not a de Polignac number, because 21107373 - 2² = 21107369 is a prime.

It is a super-2 number, since 2×21107373² = 891042389922258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21107393) 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, 15561 + ... + 16862.

It is an arithmetic number, because the mean of its divisors is an integer number (2075136).

Almost surely, 2^21107373 is an apocalyptic number.

It is an amenable number.

21107373 is a deficient number, since it is larger than the sum of its proper divisors (12094803).

21107373 is a wasteful number, since it uses less digits than its factorization.

21107373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32464.

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

The square root of 21107373 is about 4594.2761127298. The cubic root of 21107373 is about 276.3618311515.

Adding to 21107373 its reverse (37370112), we get a palindrome (58477485).

The spelling of 21107373 in words is "twenty-one million, one hundred seven thousand, three hundred seventy-three".