21344311142 has 16 divisors (see below), whose sum is σ = 39916634112. Its totient is φ = 8315965320.

The previous prime is 21344311139. The next prime is 21344311187. The reversal of 21344311142 is 24111344312.

It is a congruent number.

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, 69299558 + ... + 69299865.

It is an arithmetic number, because the mean of its divisors is an integer number (2494789632).

Almost surely, 2^21344311142 is an apocalyptic number.

21344311142 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21344311142 is a deficient number, since it is larger than the sum of its proper divisors (18572322970).

21344311142 is a wasteful number, since it uses less digits than its factorization.

21344311142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138599443.

The product of its digits is 2304, while the sum is 26.

Adding to 21344311142 its reverse (24111344312), we get a palindrome (45455655454).

The spelling of 21344311142 in words is "twenty-one billion, three hundred forty-four million, three hundred eleven thousand, one hundred forty-two".