21221303344340 has 48 divisors (see below), whose sum is σ = 48942359222400. Its totient is φ = 7665046711680.

The previous prime is 21221303344303. The next prime is 21221303344343. The reversal of 21221303344340 is 4344330312212.

It is a super-2 number, since 2×21221303344340² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21221303344297 and 21221303344306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221303344343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 323660072 + ... + 323725631.

It is an arithmetic number, because the mean of its divisors is an integer number (1019632483800).

Almost surely, 2^{21221303344340} is an apocalyptic number.

21221303344340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221303344340 is an abundant number, since it is smaller than the sum of its proper divisors (27721055878060).

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

21221303344340 is a wasteful number, since it uses less digits than its factorization.

21221303344340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647385872 (or 647385870 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 32.

Adding to 21221303344340 its reverse (4344330312212), we get a palindrome (25565633656552).

The spelling of 21221303344340 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred three million, three hundred forty-four thousand, three hundred forty".