21769793 has 8 divisors (see below), whose sum is σ = 22156800. Its totient is φ = 21385728.

The previous prime is 21769757. The next prime is 21769817. The reversal of 21769793 is 39796712.

It is a happy number.

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 21769793 - 2¹⁴ = 21753409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21769733) 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, 18305 + ... + 19457.

It is an arithmetic number, because the mean of its divisors is an integer number (2769600).

Almost surely, 2^21769793 is an apocalyptic number.

It is an amenable number.

21769793 is a deficient number, since it is larger than the sum of its proper divisors (387007).

21769793 is a wasteful number, since it uses less digits than its factorization.

21769793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471.

The product of its digits is 142884, while the sum is 44.

The square root of 21769793 is about 4665.8110763296. The cubic root of 21769793 is about 279.2231570640.

The spelling of 21769793 in words is "twenty-one million, seven hundred sixty-nine thousand, seven hundred ninety-three".