20421214042 has 16 divisors (see below), whose sum is σ = 30938656320. Its totient is φ = 10108389312.

The previous prime is 20421214001. The next prime is 20421214057. The reversal of 20421214042 is 24041212402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 756978 + ... + 783490.

It is an arithmetic number, because the mean of its divisors is an integer number (1933666020).

Almost surely, 2^20421214042 is an apocalyptic number.

20421214042 is a deficient number, since it is larger than the sum of its proper divisors (10517442278).

20421214042 is a wasteful number, since it uses less digits than its factorization.

20421214042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30357.

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 20421214042 its reverse (24041212402), we get a palindrome (44462426444).

The spelling of 20421214042 in words is "twenty billion, four hundred twenty-one million, two hundred fourteen thousand, forty-two".