21760493 has 8 divisors (see below), whose sum is σ = 23172480. Its totient is φ = 20363200.

The previous prime is 21760489. The next prime is 21760511. The reversal of 21760493 is 39406712.

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

It is a cyclic number.

It is not a de Polignac number, because 21760493 - 2² = 21760489 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21760993) 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, 533 + ... + 6618.

It is an arithmetic number, because the mean of its divisors is an integer number (2896560).

Almost surely, 2^21760493 is an apocalyptic number.

It is an amenable number.

21760493 is a deficient number, since it is larger than the sum of its proper divisors (1411987).

21760493 is a wasteful number, since it uses less digits than its factorization.

21760493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7347.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 21760493 is about 4664.8143585785. The cubic root of 21760493 is about 279.1833902607.

The spelling of 21760493 in words is "twenty-one million, seven hundred sixty thousand, four hundred ninety-three".