201321323220 has 96 divisors (see below), whose sum is σ = 571042321920. Its totient is φ = 52986885120.

The previous prime is 201321323219. The next prime is 201321323227. The reversal of 201321323220 is 22323123102.

It is a happy number.

It is a super-2 number, since 2×201321323220² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201321323227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17024910 + ... + 17036730.

It is an arithmetic number, because the mean of its divisors is an integer number (5948357520).

Almost surely, 2^201321323220 is an apocalyptic number.

201321323220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201321323220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285521160960).

201321323220 is an abundant number, since it is smaller than the sum of its proper divisors (369720998700).

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

201321323220 is a wasteful number, since it uses less digits than its factorization.

201321323220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15505 (or 15503 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 201321323220 its reverse (22323123102), we get a palindrome (223644446322).

The spelling of 201321323220 in words is "two hundred one billion, three hundred twenty-one million, three hundred twenty-three thousand, two hundred twenty".