21436341 has 16 divisors (see below), whose sum is σ = 29082240. Its totient is φ = 14043200.

The previous prime is 21436339. The next prime is 21436343. The reversal of 21436341 is 14363412.

21436341 = 220² + 221² + ... + 421².

It is an interprime number because it is at equal distance from previous prime (21436339) and next prime (21436343).

It is a cyclic number.

It is not a de Polignac number, because 21436341 - 2¹ = 21436339 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21436343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79555 + ... + 79823.

It is an arithmetic number, because the mean of its divisors is an integer number (1817640).

Almost surely, 2^21436341 is an apocalyptic number.

It is an amenable number.

21436341 is a deficient number, since it is larger than the sum of its proper divisors (7645899).

21436341 is a wasteful number, since it uses less digits than its factorization.

21436341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636.

The product of its digits is 1728, while the sum is 24.

The square root of 21436341 is about 4629.9396324358. The cubic root of 21436341 is about 277.7901777516.

Adding to 21436341 its reverse (14363412), we get a palindrome (35799753).

The spelling of 21436341 in words is "twenty-one million, four hundred thirty-six thousand, three hundred forty-one".