21155012064424 has 32 divisors (see below), whose sum is σ = 45343995981120. Its totient is φ = 9064068287616.

The previous prime is 21155012064421. The next prime is 21155012064469. The reversal of 21155012064424 is 42446021055112.

It is not an unprimeable number, because it can be changed into a prime (21155012064421) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 49063734 + ... + 49493029.

It is an arithmetic number, because the mean of its divisors is an integer number (1416999874410).

Almost surely, 2^{21155012064424} is an apocalyptic number.

It is an amenable number.

21155012064424 is an abundant number, since it is smaller than the sum of its proper divisors (24188983916696).

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

21155012064424 is a wasteful number, since it uses less digits than its factorization.

21155012064424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98560609 (or 98560605 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 37.

The spelling of 21155012064424 in words is "twenty-one trillion, one hundred fifty-five billion, twelve million, sixty-four thousand, four hundred twenty-four".