21314424340 has 96 divisors (see below), whose sum is σ = 49217414400. Its totient is φ = 7689369600.

The previous prime is 21314424253. The next prime is 21314424353. The reversal of 21314424340 is 4342441312.

It is a junction number, because it is equal to n+sod(n) for n = 21314424299 and 21314424308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25961130 + ... + 25961950.

It is an arithmetic number, because the mean of its divisors is an integer number (512681400).

Almost surely, 2^21314424340 is an apocalyptic number.

21314424340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21314424340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24608707200).

21314424340 is an abundant number, since it is smaller than the sum of its proper divisors (27902990060).

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

21314424340 is a wasteful number, since it uses less digits than its factorization.

21314424340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633 (or 1631 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21314424340 its reverse (4342441312), we get a palindrome (25656865652).

The spelling of 21314424340 in words is "twenty-one billion, three hundred fourteen million, four hundred twenty-four thousand, three hundred forty".