20101011012220 has 24 divisors (see below), whose sum is σ = 42222894436800. Its totient is φ = 8038352726592.

The previous prime is 20101011012217. The next prime is 20101011012223. The reversal of 20101011012220 is 2221011010102.

It is an interprime number because it is at equal distance from previous prime (20101011012217) and next prime (20101011012223).

It is a self number, because there is not a number n which added to its sum of digits gives 20101011012220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101011012223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128149555 + ... + 128306314.

It is an arithmetic number, because the mean of its divisors is an integer number (1759287268200).

Almost surely, 2^{20101011012220} is an apocalyptic number.

20101011012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20101011012220 is an abundant number, since it is smaller than the sum of its proper divisors (22121883424580).

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

20101011012220 is a wasteful number, since it uses less digits than its factorization.

20101011012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256459797 (or 256459795 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20101011012220 its reverse (2221011010102), we get a palindrome (22322022022322).

The spelling of 20101011012220 in words is "twenty trillion, one hundred one billion, eleven million, twelve thousand, two hundred twenty".