221111211201020 has 72 divisors (see below), whose sum is σ = 540221821723584. Its totient is φ = 75798509695104.

The previous prime is 221111211200983. The next prime is 221111211201061. The reversal of 221111211201020 is 20102112111122.

It is a self number, because there is not a number n which added to its sum of digits gives 221111211201020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9711947 + ... + 23163426.

It is an arithmetic number, because the mean of its divisors is an integer number (7503080857272).

Almost surely, 2^{221111211201020} is an apocalyptic number.

221111211201020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221111211201020 is an abundant number, since it is smaller than the sum of its proper divisors (319110610522564).

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

221111211201020 is a wasteful number, since it uses less digits than its factorization.

221111211201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32882259 (or 32882250 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221111211201020 its reverse (20102112111122), we get a palindrome (241213323312142).

The spelling of 221111211201020 in words is "two hundred twenty-one trillion, one hundred eleven billion, two hundred eleven million, two hundred one thousand, twenty".