21492193 has 8 divisors (see below), whose sum is σ = 22044512. Its totient is φ = 20946816.

The previous prime is 21492167. The next prime is 21492203. The reversal of 21492193 is 39129412.

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 21492193 - 2¹⁷ = 21361121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21492593) 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, 4846 + ... + 8152.

It is an arithmetic number, because the mean of its divisors is an integer number (2755564).

Almost surely, 2^21492193 is an apocalyptic number.

It is an amenable number.

21492193 is a deficient number, since it is larger than the sum of its proper divisors (552319).

21492193 is an equidigital number, since it uses as much as digits as its factorization.

21492193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3471.

The product of its digits is 3888, while the sum is 31.

The square root of 21492193 is about 4635.9673208512. The cubic root of 21492193 is about 278.0312276223.

The spelling of 21492193 in words is "twenty-one million, four hundred ninety-two thousand, one hundred ninety-three".