21430341 has 6 divisors (see below), whose sum is σ = 30954950. Its totient is φ = 14286888.

The previous prime is 21430327. The next prime is 21430369. The reversal of 21430341 is 14303412.

It can be written as a sum of positive squares in only one way, i.e., 20061441 + 1368900 = 4479^2 + 1170^2 .

It is not a de Polignac number, because 21430341 - 2¹⁵ = 21397573 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21430301) 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, 1190566 + ... + 1190583.

Almost surely, 2^21430341 is an apocalyptic number.

It is an amenable number.

21430341 is a deficient number, since it is larger than the sum of its proper divisors (9524609).

21430341 is a wasteful number, since it uses less digits than its factorization.

21430341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2381155 (or 2381152 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 21430341 is about 4629.2916304765. The cubic root of 21430341 is about 277.7642576471.

Adding to 21430341 its reverse (14303412), we get a palindrome (35733753).

It can be divided in two parts, 2 and 1430341, that multiplied together give a palindrome (2860682).

The spelling of 21430341 in words is "twenty-one million, four hundred thirty thousand, three hundred forty-one".