21242143203 has 16 divisors (see below), whose sum is σ = 29872846080. Its totient is φ = 13389400224.

The previous prime is 21242143183. The next prime is 21242143207. The reversal of 21242143203 is 30234124212.

It is a happy number.

It is not a de Polignac number, because 21242143203 - 2¹⁴ = 21242126819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21242143207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 341776 + ... + 399117.

It is an arithmetic number, because the mean of its divisors is an integer number (1867052880).

Almost surely, 2^21242143203 is an apocalyptic number.

21242143203 is a deficient number, since it is larger than the sum of its proper divisors (8630702877).

21242143203 is a wasteful number, since it uses less digits than its factorization.

21242143203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741418.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21242143203 its reverse (30234124212), we get a palindrome (51476267415).

The spelling of 21242143203 in words is "twenty-one billion, two hundred forty-two million, one hundred forty-three thousand, two hundred three".