20021211020220 has 96 divisors (see below), whose sum is σ = 56330979344640. Its totient is φ = 5313129346560.

The previous prime is 20021211020201. The next prime is 20021211020243. The reversal of 20021211020220 is 2202011212002.

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 20021211020220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 128585776 + ... + 128741384.

It is an arithmetic number, because the mean of its divisors is an integer number (586781034840).

Almost surely, 2^{20021211020220} is an apocalyptic number.

20021211020220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021211020220 is an abundant number, since it is smaller than the sum of its proper divisors (36309768324420).

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

20021211020220 is a wasteful number, since it uses less digits than its factorization.

20021211020220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165995 (or 165993 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20021211020220 its reverse (2202011212002), we get a palindrome (22223222232222).

The spelling of 20021211020220 in words is "twenty trillion, twenty-one billion, two hundred eleven million, twenty thousand, two hundred twenty".