21142403142 has 32 divisors (see below), whose sum is σ = 49449345792. Its totient is φ = 5900205024.

The previous prime is 21142403119. The next prime is 21142403147. The reversal of 21142403142 is 24130424112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142403147) 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, 5851573 + ... + 5855184.

It is an arithmetic number, because the mean of its divisors is an integer number (1545292056).

Almost surely, 2^21142403142 is an apocalyptic number.

21142403142 is an abundant number, since it is smaller than the sum of its proper divisors (28306942650).

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

21142403142 is a wasteful number, since it uses less digits than its factorization.

21142403142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11706812.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21142403142 its reverse (24130424112), we get a palindrome (45272827254).

The spelling of 21142403142 in words is "twenty-one billion, one hundred forty-two million, four hundred three thousand, one hundred forty-two".