20011221202220 has 12 divisors (see below), whose sum is σ = 42023564524704. Its totient is φ = 8004488480880.

The previous prime is 20011221202211. The next prime is 20011221202277. The reversal of 20011221202220 is 2220212211002.

It is a happy number.

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 3 ways as a sum of consecutive naturals, for example, 500280530036 + ... + 500280530075.

It is an arithmetic number, because the mean of its divisors is an integer number (3501963710392).

Almost surely, 2^{20011221202220} is an apocalyptic number.

20011221202220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011221202220 is an abundant number, since it is smaller than the sum of its proper divisors (22012343322484).

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

20011221202220 is a wasteful number, since it uses less digits than its factorization.

20011221202220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000561060120 (or 1000561060118 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20011221202220 its reverse (2220212211002), we get a palindrome (22231433413222).

The spelling of 20011221202220 in words is "twenty trillion, eleven billion, two hundred twenty-one million, two hundred two thousand, two hundred twenty".