21220244056024 has 48 divisors (see below), whose sum is σ = 44569656734400. Its totient is φ = 9456236060544.

The previous prime is 21220244056007. The next prime is 21220244056133. The reversal of 21220244056024 is 42065044202212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 270571944 + ... + 270650359.

It is an arithmetic number, because the mean of its divisors is an integer number (928534515300).

Almost surely, 2^{21220244056024} is an apocalyptic number.

It is an amenable number.

21220244056024 is an abundant number, since it is smaller than the sum of its proper divisors (23349412678376).

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

21220244056024 is a wasteful number, since it uses less digits than its factorization.

21220244056024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541222364 (or 541222347 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 34.

Adding to 21220244056024 its reverse (42065044202212), we get a palindrome (63285288258236).

The spelling of 21220244056024 in words is "twenty-one trillion, two hundred twenty billion, two hundred forty-four million, fifty-six thousand, twenty-four".