21203324142 has 128 divisors (see below), whose sum is σ = 57136665600. Its totient is φ = 5065943040.

The previous prime is 21203324141. The next prime is 21203324159. The reversal of 21203324142 is 24142330212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203324141) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1753734 + ... + 1765782.

It is an arithmetic number, because the mean of its divisors is an integer number (446380200).

Almost surely, 2^21203324142 is an apocalyptic number.

21203324142 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21203324142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28568332800).

21203324142 is an abundant number, since it is smaller than the sum of its proper divisors (35933341458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21203324142 is a wasteful number, since it uses less digits than its factorization.

21203324142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12378.

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

Adding to 21203324142 its reverse (24142330212), we get a palindrome (45345654354).

The spelling of 21203324142 in words is "twenty-one billion, two hundred three million, three hundred twenty-four thousand, one hundred forty-two".