20110021221220 has 96 divisors (see below), whose sum is σ = 49842346095360. Its totient is φ = 6671452792320.

The previous prime is 20110021221193. The next prime is 20110021221263. The reversal of 20110021221220 is 2212212001102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20110021221194 and 20110021221203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9786850 + ... + 11662009.

It is an arithmetic number, because the mean of its divisors is an integer number (519191105160).

Almost surely, 2^{20110021221220} is an apocalyptic number.

20110021221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20110021221220 is an abundant number, since it is smaller than the sum of its proper divisors (29732324874140).

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

20110021221220 is a wasteful number, since it uses less digits than its factorization.

20110021221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21449093 (or 21449091 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20110021221220 its reverse (2212212001102), we get a palindrome (22322233222322).

The spelling of 20110021221220 in words is "twenty trillion, one hundred ten billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty".