21050201042 has 16 divisors (see below), whose sum is σ = 35793864960. Its totient is φ = 9204136272.

The previous prime is 21050201041. The next prime is 21050201077. The reversal of 21050201042 is 24010205012.

It is a super-2 number, since 2×21050201042² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21050201042.

It is not an unprimeable number, because it can be changed into a prime (21050201041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21305378 + ... + 21306365.

It is an arithmetic number, because the mean of its divisors is an integer number (2237116560).

Almost surely, 2^21050201042 is an apocalyptic number.

21050201042 is a deficient number, since it is larger than the sum of its proper divisors (14743663918).

21050201042 is a wasteful number, since it uses less digits than its factorization.

21050201042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42611777.

The product of its (nonzero) digits is 160, while the sum is 17.

Adding to 21050201042 its reverse (24010205012), we get a palindrome (45060406054).

The spelling of 21050201042 in words is "twenty-one billion, fifty million, two hundred one thousand, forty-two".