21283191 has 6 divisors (see below), whose sum is σ = 30742400. Its totient is φ = 14188788.

The previous prime is 21283181. The next prime is 21283217. The reversal of 21283191 is 19138212.

It is not a de Polignac number, because 21283191 - 2⁶ = 21283127 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 (21283111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1182391 + ... + 1182408.

Almost surely, 2^21283191 is an apocalyptic number.

21283191 is a deficient number, since it is larger than the sum of its proper divisors (9459209).

21283191 is a wasteful number, since it uses less digits than its factorization.

21283191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2364805 (or 2364802 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 21283191 is about 4613.3708933924. The cubic root of 21283191 is about 277.1270470740.

The spelling of 21283191 in words is "twenty-one million, two hundred eighty-three thousand, one hundred ninety-one".