221200120100020 has 24 divisors (see below), whose sum is σ = 464523261598368. Its totient is φ = 88479474823200.

The previous prime is 221200120099993. The next prime is 221200120100107. The reversal of 221200120100020 is 20001021002122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32654886 + ... + 38842525.

It is an arithmetic number, because the mean of its divisors is an integer number (19355135899932).

Almost surely, 2^{221200120100020} is an apocalyptic number.

221200120100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221200120100020 is an abundant number, since it is smaller than the sum of its proper divisors (243323141498348).

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

221200120100020 is a wasteful number, since it uses less digits than its factorization.

221200120100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71652111 (or 71652109 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 221200120100020 its reverse (20001021002122), we get a palindrome (241201141102142).

The spelling of 221200120100020 in words is "two hundred twenty-one trillion, two hundred billion, one hundred twenty million, one hundred thousand, twenty".