221202021111020 has 96 divisors (see below), whose sum is σ = 501467698206720. Its totient is φ = 81710156675840.

The previous prime is 221202021110953. The next prime is 221202021111091. The reversal of 221202021111020 is 20111120202122.

It is a self number, because there is not a number n which added to its sum of digits gives 221202021111020.

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, 210126899 + ... + 211176981.

It is an arithmetic number, because the mean of its divisors is an integer number (5223621856320).

Almost surely, 2^{221202021111020} is an apocalyptic number.

221202021111020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221202021111020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250733849103360).

221202021111020 is an abundant number, since it is smaller than the sum of its proper divisors (280265677095700).

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

221202021111020 is a wasteful number, since it uses less digits than its factorization.

221202021111020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065935 (or 1065933 counting only the distinct ones).

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

Adding to 221202021111020 its reverse (20111120202122), we get a palindrome (241313141313142).

The spelling of 221202021111020 in words is "two hundred twenty-one trillion, two hundred two billion, twenty-one million, one hundred eleven thousand, twenty".