21024027 has 12 divisors (see below), whose sum is σ = 30563520. Its totient is φ = 13925808.

The previous prime is 21023971. The next prime is 21024067. The reversal of 21024027 is 72042012.

It is not a de Polignac number, because 21024027 - 2¹⁰ = 21023003 is a prime.

It is a super-2 number, since 2×21024027² = 884019422593458, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21024067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6027 + ... + 8852.

It is an arithmetic number, because the mean of its divisors is an integer number (2546960).

Almost surely, 2^21024027 is an apocalyptic number.

21024027 is a deficient number, since it is larger than the sum of its proper divisors (9539493).

21024027 is a wasteful number, since it uses less digits than its factorization.

21024027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15042 (or 15039 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 21024027 is about 4585.1965061489. The cubic root of 21024027 is about 275.9975976476.

Adding to 21024027 its reverse (72042012), we get a palindrome (93066039).

The spelling of 21024027 in words is "twenty-one million, twenty-four thousand, twenty-seven".