21761193 has 8 divisors (see below), whose sum is σ = 29094208. Its totient is φ = 14467824.

The previous prime is 21761191. The next prime is 21761219. The reversal of 21761193 is 39116712.

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

It is not a de Polignac number, because 21761193 - 2¹ = 21761191 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21761193.

It is not an unprimeable number, because it can be changed into a prime (21761191) 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, 8605 + ... + 10842.

It is an arithmetic number, because the mean of its divisors is an integer number (3636776).

Almost surely, 2^21761193 is an apocalyptic number.

It is an amenable number.

21761193 is a deficient number, since it is larger than the sum of its proper divisors (7333015).

21761193 is a wasteful number, since it uses less digits than its factorization.

21761193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19823.

The product of its digits is 2268, while the sum is 30.

The square root of 21761193 is about 4664.8893877562. The cubic root of 21761193 is about 279.1863838553.

The spelling of 21761193 in words is "twenty-one million, seven hundred sixty-one thousand, one hundred ninety-three".