21240132125 has 32 divisors (see below), whose sum is σ = 27489037056. Its totient is φ = 16371979200.

The previous prime is 21240132113. The next prime is 21240132139. The reversal of 21240132125 is 52123104212.

It is not a de Polignac number, because 21240132125 - 2¹² = 21240128029 is a prime.

It is a super-2 number, since 2×21240132125² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21240132125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 454082 + ... + 498668.

It is an arithmetic number, because the mean of its divisors is an integer number (859032408).

Almost surely, 2^21240132125 is an apocalyptic number.

21240132125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21240132125 is a deficient number, since it is larger than the sum of its proper divisors (6248904931).

21240132125 is a wasteful number, since it uses less digits than its factorization.

21240132125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44742 (or 44732 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 21240132125 its reverse (52123104212), we get a palindrome (73363236337).

The spelling of 21240132125 in words is "twenty-one billion, two hundred forty million, one hundred thirty-two thousand, one hundred twenty-five".