21011001221322 has 48 divisors (see below), whose sum is σ = 52045163913600. Its totient is φ = 6001075191456.

The previous prime is 21011001221311. The next prime is 21011001221323. The reversal of 21011001221322 is 22312210011012.

21011001221322 is a `hidden beast` number, since 2 + 10 + 110 + 0 + 1 + 221 + 322 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21011001221295 and 21011001221304.

It is not an unprimeable number, because it can be changed into a prime (21011001221323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28355197 + ... + 29086752.

It is an arithmetic number, because the mean of its divisors is an integer number (1084274248200).

Almost surely, 2^{21011001221322} is an apocalyptic number.

21011001221322 is an abundant number, since it is smaller than the sum of its proper divisors (31034162692278).

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

21011001221322 is a wasteful number, since it uses less digits than its factorization.

21011001221322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57444867 (or 57444864 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21011001221322 its reverse (22312210011012), we get a palindrome (43323211232334).

The spelling of 21011001221322 in words is "twenty-one trillion, eleven billion, one million, two hundred twenty-one thousand, three hundred twenty-two".