21793967 has 8 divisors (see below), whose sum is σ = 23768640. Its totient is φ = 19861920.

The previous prime is 21793927. The next prime is 21793973. The reversal of 21793967 is 76939712.

It is a happy number.

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

It is not a de Polignac number, because 21793967 - 2²² = 17599663 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 (21793927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9584 + ... + 11637.

It is an arithmetic number, because the mean of its divisors is an integer number (2971080).

Almost surely, 2^21793967 is an apocalyptic number.

21793967 is a deficient number, since it is larger than the sum of its proper divisors (1974673).

21793967 is a wasteful number, since it uses less digits than its factorization.

21793967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21313.

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

The square root of 21793967 is about 4668.4009039499. The cubic root of 21793967 is about 279.3264721434.

The spelling of 21793967 in words is "twenty-one million, seven hundred ninety-three thousand, nine hundred sixty-seven".