21124266462640 has 40 divisors (see below), whose sum is σ = 53578821302928. Its totient is φ = 7681551440640.

The previous prime is 21124266462631. The next prime is 21124266462647. The reversal of 21124266462640 is 4626466242112.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (21124266462647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12002423247 + ... + 12002425006.

Almost surely, 2^{21124266462640} is an apocalyptic number.

21124266462640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21124266462640 is an abundant number, since it is smaller than the sum of its proper divisors (32454554840288).

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

21124266462640 is a wasteful number, since it uses less digits than its factorization.

21124266462640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24004848277 (or 24004848271 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 46.

The spelling of 21124266462640 in words is "twenty-one trillion, one hundred twenty-four billion, two hundred sixty-six million, four hundred sixty-two thousand, six hundred forty".