21014521 has 8 divisors (see below), whose sum is σ = 23202144. Its totient is φ = 18873120.

The previous prime is 21014501. The next prime is 21014527. The reversal of 21014521 is 12541012.

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 21014521 - 2¹³ = 21006329 is a prime.

It is a super-2 number, since 2×21014521² = 883220185718882, 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 junction number, because it is equal to n+sod(n) for n = 21014495 and 21014504.

It is not an unprimeable number, because it can be changed into a prime (21014527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10596 + ... + 12421.

It is an arithmetic number, because the mean of its divisors is an integer number (2900268).

Almost surely, 2^21014521 is an apocalyptic number.

It is an amenable number.

21014521 is a deficient number, since it is larger than the sum of its proper divisors (2187623).

21014521 is a wasteful number, since it uses less digits than its factorization.

21014521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23111.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 21014521 is about 4584.1597921538. The cubic root of 21014521 is about 275.9559939992.

Adding to 21014521 its reverse (12541012), we get a palindrome (33555533).

The spelling of 21014521 in words is "twenty-one million, fourteen thousand, five hundred twenty-one".