21193141 has 4 divisors (see below), whose sum is σ = 21483532. Its totient is φ = 20902752.

The previous prime is 21193127. The next prime is 21193147. The reversal of 21193141 is 14139112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6022116 + 15171025 = 2454^2 + 3895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21193141 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 (21193147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145086 + ... + 145231.

It is an arithmetic number, because the mean of its divisors is an integer number (5370883).

Almost surely, 2^21193141 is an apocalyptic number.

It is an amenable number.

21193141 is a deficient number, since it is larger than the sum of its proper divisors (290391).

21193141 is an equidigital number, since it uses as much as digits as its factorization.

21193141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290390.

The product of its digits is 216, while the sum is 22.

The square root of 21193141 is about 4603.6008732296. The cubic root of 21193141 is about 276.7356494815.

The spelling of 21193141 in words is "twenty-one million, one hundred ninety-three thousand, one hundred forty-one".