21220320301312 has 36 divisors (see below), whose sum is σ = 46208453162256. Its totient is φ = 9645600135680.

The previous prime is 21220320301249. The next prime is 21220320301387. The reversal of 21220320301312 is 21310302302212.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3767809738 + ... + 3767815369.

It is an arithmetic number, because the mean of its divisors is an integer number (1283568143396).

Almost surely, 2^{21220320301312} is an apocalyptic number.

21220320301312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21220320301312 is an abundant number, since it is smaller than the sum of its proper divisors (24988132860944).

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

21220320301312 is an equidigital number, since it uses as much as digits as its factorization.

21220320301312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7535625134 (or 7535625120 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21220320301312 its reverse (21310302302212), we get a palindrome (42530622603524).

Subtracting 21220320301312 from its reverse (21310302302212), we obtain a square (89982000900 = 299970²).

The spelling of 21220320301312 in words is "twenty-one trillion, two hundred twenty billion, three hundred twenty million, three hundred one thousand, three hundred twelve".