21513143442 has 32 divisors (see below), whose sum is σ = 52065424512. Its totient is φ = 5785046784.

The previous prime is 21513143441. The next prime is 21513143453. The reversal of 21513143442 is 24434131512.

It is not an unprimeable number, because it can be changed into a prime (21513143441) 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, 15064513 + ... + 15065940.

It is an arithmetic number, because the mean of its divisors is an integer number (1627044516).

Almost surely, 2^21513143442 is an apocalyptic number.

21513143442 is an abundant number, since it is smaller than the sum of its proper divisors (30552281070).

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

21513143442 is a wasteful number, since it uses less digits than its factorization.

21513143442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30130482.

The product of its digits is 11520, while the sum is 30.

Adding to 21513143442 its reverse (24434131512), we get a palindrome (45947274954).

The spelling of 21513143442 in words is "twenty-one billion, five hundred thirteen million, one hundred forty-three thousand, four hundred forty-two".