21202144042 has 16 divisors (see below), whose sum is σ = 33480295200. Its totient is φ = 10042153200.

The previous prime is 21202144039. The next prime is 21202144049. The reversal of 21202144042 is 24044120212.

It is not an unprimeable number, because it can be changed into a prime (21202144049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 514084 + ... + 553792.

It is an arithmetic number, because the mean of its divisors is an integer number (2092518450).

Almost surely, 2^21202144042 is an apocalyptic number.

21202144042 is a deficient number, since it is larger than the sum of its proper divisors (12278151158).

21202144042 is a wasteful number, since it uses less digits than its factorization.

21202144042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53781.

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

Adding to 21202144042 its reverse (24044120212), we get a palindrome (45246264254).

The spelling of 21202144042 in words is "twenty-one billion, two hundred two million, one hundred forty-four thousand, forty-two".