201220021320 has 64 divisors (see below), whose sum is σ = 609520878720. Its totient is φ = 53137711104.

The previous prime is 201220021313. The next prime is 201220021333. The reversal of 201220021320 is 23120022102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 201220021320.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8127609 + ... + 8152328.

It is an arithmetic number, because the mean of its divisors is an integer number (9523763730).

Almost surely, 2^201220021320 is an apocalyptic number.

201220021320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201220021320 is an abundant number, since it is smaller than the sum of its proper divisors (408300857400).

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

201220021320 is a wasteful number, since it uses less digits than its factorization.

201220021320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16280054 (or 16280050 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 201220021320 its reverse (23120022102), we get a palindrome (224340043422).

The spelling of 201220021320 in words is "two hundred one billion, two hundred twenty million, twenty-one thousand, three hundred twenty".