21214421112340 has 12 divisors (see below), whose sum is σ = 44550284335956. Its totient is φ = 8485768444928.

The previous prime is 21214421112331. The next prime is 21214421112341. The reversal of 21214421112340 is 4321112441212.

It can be written as a sum of positive squares in 2 ways, for example, as 2274534520336 + 18939886592004 = 1508156^2 + 4351998^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21214421112299 and 21214421112308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214421112341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530360527789 + ... + 530360527828.

It is an arithmetic number, because the mean of its divisors is an integer number (3712523694663).

Almost surely, 2^{21214421112340} is an apocalyptic number.

21214421112340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21214421112340 is an abundant number, since it is smaller than the sum of its proper divisors (23335863223616).

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

21214421112340 is a wasteful number, since it uses less digits than its factorization.

21214421112340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060721055626 (or 1060721055624 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

Adding to 21214421112340 its reverse (4321112441212), we get a palindrome (25535533553552).

The spelling of 21214421112340 in words is "twenty-one trillion, two hundred fourteen billion, four hundred twenty-one million, one hundred twelve thousand, three hundred forty".