21367793 has 12 divisors (see below), whose sum is σ = 22943952. Its totient is φ = 19894080.

The previous prime is 21367781. The next prime is 21367807. The reversal of 21367793 is 39776312.

It is not a de Polignac number, because 21367793 - 2⁴ = 21367777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21367733) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30578 + ... + 31268.

It is an arithmetic number, because the mean of its divisors is an integer number (1911996).

Almost surely, 2^21367793 is an apocalyptic number.

It is an amenable number.

21367793 is a deficient number, since it is larger than the sum of its proper divisors (1576159).

21367793 is a wasteful number, since it uses less digits than its factorization.

21367793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832 (or 815 counting only the distinct ones).

The product of its digits is 47628, while the sum is 38.

The square root of 21367793 is about 4622.5310166618. The cubic root of 21367793 is about 277.4937606475.

The spelling of 21367793 in words is "twenty-one million, three hundred sixty-seven thousand, seven hundred ninety-three".