21355424124456 has 32 divisors (see below), whose sum is σ = 55110771936000. Its totient is φ = 6888846491520.

The previous prime is 21355424124439. The next prime is 21355424124493. The reversal of 21355424124456 is 65442142455312.

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 7 ways as a sum of consecutive naturals, for example, 14351762781 + ... + 14351764268.

It is an arithmetic number, because the mean of its divisors is an integer number (1722211623000).

Almost surely, 2^{21355424124456} is an apocalyptic number.

It is an amenable number.

21355424124456 is an abundant number, since it is smaller than the sum of its proper divisors (33755347811544).

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

21355424124456 is a wasteful number, since it uses less digits than its factorization.

21355424124456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28703527089 (or 28703527085 counting only the distinct ones).

The product of its digits is 4608000, while the sum is 48.

Adding to 21355424124456 its reverse (65442142455312), we get a palindrome (86797566579768).

The spelling of 21355424124456 in words is "twenty-one trillion, three hundred fifty-five billion, four hundred twenty-four million, one hundred twenty-four thousand, four hundred fifty-six".