21013022221312 has 66 divisors (see below), whose sum is σ = 46171361267654. Its totient is φ = 9551373680640.

The previous prime is 21013022221309. The next prime is 21013022221343. The reversal of 21013022221312 is 21312222031012.

It can be written as a sum of positive squares in only one way, i.e., 20772592828416 + 240429392896 = 4557696^2 + 490336^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 84671673 + ... + 84919480.

Almost surely, 2^{21013022221312} is an apocalyptic number.

21013022221312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21013022221312 is an abundant number, since it is smaller than the sum of its proper divisors (25158339046342).

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

21013022221312 is a wasteful number, since it uses less digits than its factorization.

21013022221312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169591195 (or 169591166 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21013022221312 its reverse (21312222031012), we get a palindrome (42325244252324).

The spelling of 21013022221312 in words is "twenty-one trillion, thirteen billion, twenty-two million, two hundred twenty-one thousand, three hundred twelve".