21220304042424 has 64 divisors (see below), whose sum is σ = 58270857811200. Its totient is φ = 6409794352896.

The previous prime is 21220304042387. The next prime is 21220304042489. The reversal of 21220304042424 is 42424040302212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21220304042391 and 21220304042400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1011636349 + ... + 1011657324.

It is an arithmetic number, because the mean of its divisors is an integer number (910482153300).

Almost surely, 2^{21220304042424} is an apocalyptic number.

21220304042424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21220304042424 is an abundant number, since it is smaller than the sum of its proper divisors (37050553768776).

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

21220304042424 is a wasteful number, since it uses less digits than its factorization.

21220304042424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2023293724 (or 2023293720 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 30.

Adding to 21220304042424 its reverse (42424040302212), we get a palindrome (63644344344636).

The spelling of 21220304042424 in words is "twenty-one trillion, two hundred twenty billion, three hundred four million, forty-two thousand, four hundred twenty-four".