21420422441024 has 112 divisors (see below), whose sum is σ = 45178825161600. Its totient is φ = 10041678766080.

The previous prime is 21420422440943. The next prime is 21420422441027. The reversal of 21420422441024 is 42014422402412.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (21420422441027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304314314 + ... + 304384694.

Almost surely, 2^{21420422441024} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21420422441024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22589412580800).

21420422441024 is an abundant number, since it is smaller than the sum of its proper divisors (23758402720576).

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

21420422441024 is a wasteful number, since it uses less digits than its factorization.

21420422441024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71476 (or 71466 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 32.

Adding to 21420422441024 its reverse (42014422402412), we get a palindrome (63434844843436).

The spelling of 21420422441024 in words is "twenty-one trillion, four hundred twenty billion, four hundred twenty-two million, four hundred forty-one thousand, twenty-four".