221101020020 has 48 divisors (see below), whose sum is σ = 466843245120. Its totient is φ = 87958542336.

The previous prime is 221101019989. The next prime is 221101020061. The reversal of 221101020020 is 20020101122.

It is a happy number.

It is a super-2 number, since 2×221101020020² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221101019983 and 221101020010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24402251 + ... + 24411309.

It is an arithmetic number, because the mean of its divisors is an integer number (9725900940).

Almost surely, 2^221101020020 is an apocalyptic number.

221101020020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221101020020 is an abundant number, since it is smaller than the sum of its proper divisors (245742225100).

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

221101020020 is a wasteful number, since it uses less digits than its factorization.

221101020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15584 (or 15582 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 221101020020 its reverse (20020101122), we get a palindrome (241121121142).

The spelling of 221101020020 in words is "two hundred twenty-one billion, one hundred one million, twenty thousand, twenty".