221100220020 has 24 divisors (see below), whose sum is σ = 619080616224. Its totient is φ = 58960058656.

The previous prime is 221100220007. The next prime is 221100220057. The reversal of 221100220020 is 20022001122.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 221100219978 and 221100220005.

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, 1842501774 + ... + 1842501893.

It is an arithmetic number, because the mean of its divisors is an integer number (25795025676).

Almost surely, 2^221100220020 is an apocalyptic number.

221100220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221100220020 is an abundant number, since it is smaller than the sum of its proper divisors (397980396204).

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

221100220020 is a wasteful number, since it uses less digits than its factorization.

221100220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3685003679 (or 3685003677 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 221100220020 its reverse (20022001122), we get a palindrome (241122221142).

The spelling of 221100220020 in words is "two hundred twenty-one billion, one hundred million, two hundred twenty thousand, twenty".