21126052640 has 96 divisors (see below), whose sum is σ = 62225864064. Its totient is φ = 6584739840.

The previous prime is 21126052631. The next prime is 21126052669. The reversal of 21126052640 is 4625062112.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 845069 + ... + 869708.

It is an arithmetic number, because the mean of its divisors is an integer number (648186084).

Almost surely, 2^21126052640 is an apocalyptic number.

21126052640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21126052640 is an abundant number, since it is smaller than the sum of its proper divisors (41099811424).

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

21126052640 is a wasteful number, since it uses less digits than its factorization.

21126052640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1714810 (or 1714802 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The spelling of 21126052640 in words is "twenty-one billion, one hundred twenty-six million, fifty-two thousand, six hundred forty".