21412402340 has 96 divisors (see below), whose sum is σ = 52471991040. Its totient is φ = 7188258816.

The previous prime is 21412402331. The next prime is 21412402357. The reversal of 21412402340 is 4320421412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1413044 + ... + 1428116.

It is an arithmetic number, because the mean of its divisors is an integer number (546583240).

Almost surely, 2^21412402340 is an apocalyptic number.

21412402340 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 21412402340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26235995520).

21412402340 is an abundant number, since it is smaller than the sum of its proper divisors (31059588700).

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

21412402340 is a wasteful number, since it uses less digits than its factorization.

21412402340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15301 (or 15299 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21412402340 its reverse (4320421412), we get a palindrome (25732823752).

The spelling of 21412402340 in words is "twenty-one billion, four hundred twelve million, four hundred two thousand, three hundred forty".