21024612 has 36 divisors (see below), whose sum is σ = 60738496. Its totient is φ = 6006960.

The previous prime is 21024607. The next prime is 21024613. The reversal of 21024612 is 21642012.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21024613) 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, 41464 + ... + 41967.

Almost surely, 2^21024612 is an apocalyptic number.

It is an amenable number.

21024612 is an abundant number, since it is smaller than the sum of its proper divisors (39713884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21024612 is a wasteful number, since it uses less digits than its factorization.

21024612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83448 (or 83443 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 21024612 is about 4585.2602979547. The cubic root of 21024612 is about 276.0001575298. Note that the first 3 decimals are identical.

Adding to 21024612 its reverse (21642012), we get a palindrome (42666624).

The spelling of 21024612 in words is "twenty-one million, twenty-four thousand, six hundred twelve".