21014523 has 6 divisors (see below), whose sum is σ = 30354324. Its totient is φ = 14009676.

The previous prime is 21014501. The next prime is 21014527. The reversal of 21014523 is 32541012.

21014523 is a `hidden beast` number, since 210 + 1 + 452 + 3 = 666.

It is not a de Polignac number, because 21014523 - 2⁶ = 21014459 is a prime.

It is a super-2 number, since 2×21014523² = 883220353835058, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 21014496 and 21014505.

It is not an unprimeable number, because it can be changed into a prime (21014527) 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, 1167465 + ... + 1167482.

It is an arithmetic number, because the mean of its divisors is an integer number (5059054).

Almost surely, 2^21014523 is an apocalyptic number.

21014523 is a deficient number, since it is larger than the sum of its proper divisors (9339801).

21014523 is a wasteful number, since it uses less digits than its factorization.

21014523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334953 (or 2334950 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 21014523 is about 4584.1600102963. The cubic root of 21014523 is about 275.9560027536.

Adding to 21014523 its reverse (32541012), we get a palindrome (53555535).

The spelling of 21014523 in words is "twenty-one million, fourteen thousand, five hundred twenty-three".