21101373 has 12 divisors (see below), whose sum is σ = 31805280. Its totient is φ = 13455816.

The previous prime is 21101371. The next prime is 21101383. The reversal of 21101373 is 37310112.

It is not a de Polignac number, because 21101373 - 2¹ = 21101371 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101371) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50763 + ... + 51176.

It is an arithmetic number, because the mean of its divisors is an integer number (2650440).

Almost surely, 2^21101373 is an apocalyptic number.

21101373 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21101373 is a deficient number, since it is larger than the sum of its proper divisors (10703907).

21101373 is a wasteful number, since it uses less digits than its factorization.

21101373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101968 (or 101965 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 18.

The square root of 21101373 is about 4593.6230798793. The cubic root of 21101373 is about 276.3356423859.

Adding to 21101373 its reverse (37310112), we get a palindrome (58411485).

The spelling of 21101373 in words is "twenty-one million, one hundred one thousand, three hundred seventy-three".