201321002020 has 12 divisors (see below), whose sum is σ = 422774104284. Its totient is φ = 80528400800.

The previous prime is 201321001979. The next prime is 201321002021. The reversal of 201321002020 is 20200123102.

It can be written as a sum of positive squares in 2 ways, for example, as 56428102116 + 144892899904 = 237546^2 + 380648^2 .

It is not an unprimeable number, because it can be changed into a prime (201321002021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5033025031 + ... + 5033025070.

It is an arithmetic number, because the mean of its divisors is an integer number (35231175357).

Almost surely, 2^201321002020 is an apocalyptic number.

201321002020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201321002020 is an abundant number, since it is smaller than the sum of its proper divisors (221453102264).

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

201321002020 is a wasteful number, since it uses less digits than its factorization.

201321002020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10066050110 (or 10066050108 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 201321002020 its reverse (20200123102), we get a palindrome (221521125122).

The spelling of 201321002020 in words is "two hundred one billion, three hundred twenty-one million, two thousand, twenty".