21344143460 has 24 divisors (see below), whose sum is σ = 44827661760. Its totient is φ = 8536712544.

The previous prime is 21344143441. The next prime is 21344143477. The reversal of 21344143460 is 6434144312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143057 + ... + 251303.

It is an arithmetic number, because the mean of its divisors is an integer number (1867819240).

Almost surely, 2^21344143460 is an apocalyptic number.

21344143460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21344143460 is an abundant number, since it is smaller than the sum of its proper divisors (23483518300).

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

21344143460 is a wasteful number, since it uses less digits than its factorization.

21344143460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118115 (or 118113 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 21344143460 its reverse (6434144312), we get a palindrome (27778287772).

The spelling of 21344143460 in words is "twenty-one billion, three hundred forty-four million, one hundred forty-three thousand, four hundred sixty".