221012101212020 has 24 divisors (see below), whose sum is σ = 464146883842824. Its totient is φ = 88400750713856.

The previous prime is 221012101211981. The next prime is 221012101212029. The reversal of 221012101212020 is 20212101210122.

It can be written as a sum of positive squares in 4 ways, for example, as 46971997446544 + 174040103765476 = 6853612^2 + 13192426^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221012101212020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012101212029) 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, 255167537 + ... + 256032216.

It is an arithmetic number, because the mean of its divisors is an integer number (19339453493451).

Almost surely, 2^{221012101212020} is an apocalyptic number.

221012101212020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221012101212020 is an abundant number, since it is smaller than the sum of its proper divisors (243134782630804).

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

221012101212020 is a wasteful number, since it uses less digits than its factorization.

221012101212020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511221379 (or 511221377 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221012101212020 its reverse (20212101210122), we get a palindrome (241224202422142).

The spelling of 221012101212020 in words is "two hundred twenty-one trillion, twelve billion, one hundred one million, two hundred twelve thousand, twenty".