21140024 has 16 divisors (see below), whose sum is σ = 40709400. Its totient is φ = 10284192.

The previous prime is 21140011. The next prime is 21140033. The reversal of 21140024 is 42004112.

It is a super-2 number, since 2×21140024² = 893801229441152, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21139990 and 21140008.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35414 + ... + 36005.

Almost surely, 2^21140024 is an apocalyptic number.

It is an amenable number.

21140024 is a deficient number, since it is larger than the sum of its proper divisors (19569376).

21140024 is a wasteful number, since it uses less digits than its factorization.

21140024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71462 (or 71458 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 21140024 is about 4597.8281829577. The cubic root of 21140024 is about 276.5042591289.

Adding to 21140024 its reverse (42004112), we get a palindrome (63144136).

The spelling of 21140024 in words is "twenty-one million, one hundred forty thousand, twenty-four".