21240124152 has 48 divisors (see below), whose sum is σ = 57499163640. Its totient is φ = 6535421568.

The previous prime is 21240124097. The next prime is 21240124237. The reversal of 21240124152 is 25142104212.

It is a super-2 number, since 2×21240124152² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2614303 + ... + 2622414.

Almost surely, 2^21240124152 is an apocalyptic number.

It is an amenable number.

21240124152 is an abundant number, since it is smaller than the sum of its proper divisors (36259039488).

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

21240124152 is a wasteful number, since it uses less digits than its factorization.

21240124152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5236752 (or 5236735 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

Adding to 21240124152 its reverse (25142104212), we get a palindrome (46382228364).

The spelling of 21240124152 in words is "twenty-one billion, two hundred forty million, one hundred twenty-four thousand, one hundred fifty-two".