221001000020 has 48 divisors (see below), whose sum is σ = 499889691840. Its totient is φ = 81800119296.

The previous prime is 221000999983. The next prime is 221001000029. The reversal of 221001000020 is 20000100122.

221001000020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221000999971 and 221001000007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001000029) 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, 6746237 + ... + 6778916.

It is an arithmetic number, because the mean of its divisors is an integer number (10414368580).

Almost surely, 2^221001000020 is an apocalyptic number.

221001000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221001000020 is an abundant number, since it is smaller than the sum of its proper divisors (278888691820).

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

221001000020 is a wasteful number, since it uses less digits than its factorization.

221001000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13525224 (or 13525222 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

Adding to 221001000020 its reverse (20000100122), we get a palindrome (241001100142).

The spelling of 221001000020 in words is "two hundred twenty-one billion, one million, twenty", and thus it is an aban number.