21240312024 has 16 divisors (see below), whose sum is σ = 53100780120. Its totient is φ = 7080104000.

The previous prime is 21240311987. The next prime is 21240312029. The reversal of 21240312024 is 42021304212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21240312029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 442506477 + ... + 442506524.

Almost surely, 2^21240312024 is an apocalyptic number.

21240312024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21240312024 is an abundant number, since it is smaller than the sum of its proper divisors (31860468096).

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

21240312024 is a wasteful number, since it uses less digits than its factorization.

21240312024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885013010 (or 885013006 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21240312024 its reverse (42021304212), we get a palindrome (63261616236).

The spelling of 21240312024 in words is "twenty-one billion, two hundred forty million, three hundred twelve thousand, twenty-four".