21434455421088 has 48 divisors (see below), whose sum is σ = 56266628011776. Its totient is φ = 7144668311040.

The previous prime is 21434455420999. The next prime is 21434455421089. The reversal of 21434455421088 is 88012455443412.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 21434455421088.

It is not an unprimeable number, because it can be changed into a prime (21434455421089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2292753 + ... + 6937263.

It is an arithmetic number, because the mean of its divisors is an integer number (1172221416912).

Almost surely, 2^{21434455421088} is an apocalyptic number.

It is an amenable number.

21434455421088 is an abundant number, since it is smaller than the sum of its proper divisors (34832172590688).

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

21434455421088 is a wasteful number, since it uses less digits than its factorization.

21434455421088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4692597 (or 4692589 counting only the distinct ones).

The product of its (nonzero) digits is 4915200, while the sum is 51.

The spelling of 21434455421088 in words is "twenty-one trillion, four hundred thirty-four billion, four hundred fifty-five million, four hundred twenty-one thousand, eighty-eight".