21761373 has 8 divisors (see below), whose sum is σ = 29412928. Its totient is φ = 14308704.

The previous prime is 21761371. The next prime is 21761387. The reversal of 21761373 is 37316712.

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

It is not a de Polignac number, because 21761373 - 2¹ = 21761371 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21761373.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21761371) 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, 49465 + ... + 49902.

It is an arithmetic number, because the mean of its divisors is an integer number (3676616).

Almost surely, 2^21761373 is an apocalyptic number.

It is an amenable number.

21761373 is a deficient number, since it is larger than the sum of its proper divisors (7651555).

21761373 is an equidigital number, since it uses as much as digits as its factorization.

21761373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99443.

The product of its digits is 5292, while the sum is 30.

The square root of 21761373 is about 4664.9086807782. The cubic root of 21761373 is about 279.1871536263.

The spelling of 21761373 in words is "twenty-one million, seven hundred sixty-one thousand, three hundred seventy-three".