20011201221020 has 48 divisors (see below), whose sum is σ = 42039303118848. Its totient is φ = 8001475310400.

The previous prime is 20011201221017. The next prime is 20011201221049. The reversal of 20011201221020 is 2012210211002.

It is a junction number, because it is equal to n+sod(n) for n = 20011201220986 and 20011201221004.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 715515077 + ... + 715543043.

It is an arithmetic number, because the mean of its divisors is an integer number (875818814976).

Almost surely, 2^{20011201221020} is an apocalyptic number.

20011201221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011201221020 is an abundant number, since it is smaller than the sum of its proper divisors (22028101897828).

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

20011201221020 is a wasteful number, since it uses less digits than its factorization.

20011201221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40130 (or 40128 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20011201221020 its reverse (2012210211002), we get a palindrome (22023411432022).

The spelling of 20011201221020 in words is "twenty trillion, eleven billion, two hundred one million, two hundred twenty-one thousand, twenty".