21020132042 has 16 divisors (see below), whose sum is σ = 38806397952. Its totient is φ = 8315656560.

The previous prime is 21020132017. The next prime is 21020132057. The reversal of 21020132042 is 24023102012.

It is a self number, because there is not a number n which added to its sum of digits gives 21020132042.

It is an unprimeable number.

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, 57747434 + ... + 57747797.

It is an arithmetic number, because the mean of its divisors is an integer number (2425399872).

Almost surely, 2^21020132042 is an apocalyptic number.

21020132042 is a deficient number, since it is larger than the sum of its proper divisors (17786265910).

21020132042 is a wasteful number, since it uses less digits than its factorization.

21020132042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115495253.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21020132042 its reverse (24023102012), we get a palindrome (45043234054).

The spelling of 21020132042 in words is "twenty-one billion, twenty million, one hundred thirty-two thousand, forty-two".