221200121200020 has 48 divisors (see below), whose sum is σ = 619985324732928. Its totient is φ = 58927176570240.

The previous prime is 221200121199989. The next prime is 221200121200027. The reversal of 221200121200020 is 20002121002122.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221200121200027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1860015559 + ... + 1860134478.

It is an arithmetic number, because the mean of its divisors is an integer number (12916360931936).

Almost surely, 2^{221200121200020} is an apocalyptic number.

221200121200020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221200121200020 is an abundant number, since it is smaller than the sum of its proper divisors (398785203532908).

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

221200121200020 is a wasteful number, since it uses less digits than its factorization.

221200121200020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3720151040 (or 3720151038 counting only the distinct ones).

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

Adding to 221200121200020 its reverse (20002121002122), we get a palindrome (241202242202142).

The spelling of 221200121200020 in words is "two hundred twenty-one trillion, two hundred billion, one hundred twenty-one million, two hundred thousand, twenty".