21014541 has 6 divisors (see below), whose sum is σ = 30354350. Its totient is φ = 14009688.

The previous prime is 21014527. The next prime is 21014579. The reversal of 21014541 is 14541012.

21014541 is a `hidden beast` number, since 210 + 1 + 454 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20738916 + 275625 = 4554^2 + 525^2 .

It is not a de Polignac number, because 21014541 - 2¹⁴ = 20998157 is a prime.

It is a super-2 number, since 2×21014541² = 883221866881362, which contains 22 as substring.

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 (21014501) 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, 1167466 + ... + 1167483.

Almost surely, 2^21014541 is an apocalyptic number.

It is an amenable number.

21014541 is a deficient number, since it is larger than the sum of its proper divisors (9339809).

21014541 is a wasteful number, since it uses less digits than its factorization.

21014541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334955 (or 2334952 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 21014541 is about 4584.1619735782. The cubic root of 21014541 is about 275.9560815437.

Adding to 21014541 its reverse (14541012), we get a palindrome (35555553).

The spelling of 21014541 in words is "twenty-one million, fourteen thousand, five hundred forty-one".