20421202224 has 20 divisors (see below), whose sum is σ = 52754772536. Its totient is φ = 6807067392.

The previous prime is 20421202169. The next prime is 20421202237. The reversal of 20421202224 is 42220212402.

It is a self number, because there is not a number n which added to its sum of digits gives 20421202224.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212720809 + ... + 212720904.

Almost surely, 2^20421202224 is an apocalyptic number.

20421202224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20421202224 is an abundant number, since it is smaller than the sum of its proper divisors (32333570312).

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

20421202224 is a wasteful number, since it uses less digits than its factorization.

20421202224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425441724 (or 425441718 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 21.

Adding to 20421202224 its reverse (42220212402), we get a palindrome (62641414626).

The spelling of 20421202224 in words is "twenty billion, four hundred twenty-one million, two hundred two thousand, two hundred twenty-four".