21214214340 has 96 divisors (see below), whose sum is σ = 64823141376. Its totient is φ = 5140986240.

The previous prime is 21214214323. The next prime is 21214214341. The reversal of 21214214340 is 4341241212.

It is a self number, because there is not a number n which added to its sum of digits gives 21214214340.

It is not an unprimeable number, because it can be changed into a prime (21214214341) by changing a digit.

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, 3034489 + ... + 3041471.

It is an arithmetic number, because the mean of its divisors is an integer number (675241056).

Almost surely, 2^21214214340 is an apocalyptic number.

21214214340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21214214340 is an abundant number, since it is smaller than the sum of its proper divisors (43608927036).

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

21214214340 is a wasteful number, since it uses less digits than its factorization.

21214214340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11609 (or 11607 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21214214340 its reverse (4341241212), we get a palindrome (25555455552).

The spelling of 21214214340 in words is "twenty-one billion, two hundred fourteen million, two hundred fourteen thousand, three hundred forty".