21623545135540 has 48 divisors (see below), whose sum is σ = 46068558689664. Its totient is φ = 8523975958400.

The previous prime is 21623545135529. The next prime is 21623545135559. The reversal of 21623545135540 is 4553154532612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116595 + ... + 6577285.

It is an arithmetic number, because the mean of its divisors is an integer number (959761639368).

Almost surely, 2^{21623545135540} is an apocalyptic number.

21623545135540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21623545135540 is an abundant number, since it is smaller than the sum of its proper divisors (24445013554124).

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

21623545135540 is a wasteful number, since it uses less digits than its factorization.

21623545135540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6463128 (or 6463126 counting only the distinct ones).

The product of its (nonzero) digits is 2160000, while the sum is 46.

The spelling of 21623545135540 in words is "twenty-one trillion, six hundred twenty-three billion, five hundred forty-five million, one hundred thirty-five thousand, five hundred forty".