221020099980 has 24 divisors (see below), whose sum is σ = 618856280112. Its totient is φ = 58938693312.

The previous prime is 221020099897. The next prime is 221020099999. The reversal of 221020099980 is 89990020122.

It is a happy 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, 1841834107 + ... + 1841834226.

It is an arithmetic number, because the mean of its divisors is an integer number (25785678338).

Almost surely, 2^221020099980 is an apocalyptic number.

221020099980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221020099980 is an abundant number, since it is smaller than the sum of its proper divisors (397836180132).

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

221020099980 is a wasteful number, since it uses less digits than its factorization.

221020099980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3683668345 (or 3683668343 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 42.

The spelling of 221020099980 in words is "two hundred twenty-one billion, twenty million, ninety-nine thousand, nine hundred eighty".