221001002020 has 12 divisors (see below), whose sum is σ = 464102104284. Its totient is φ = 88400400800.

The previous prime is 221001002009. The next prime is 221001002059. The reversal of 221001002020 is 20200100122.

It can be written as a sum of positive squares in 2 ways, for example, as 122540603364 + 98460398656 = 350058^2 + 313784^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 221001001988 and 221001002006.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5525025031 + ... + 5525025070.

It is an arithmetic number, because the mean of its divisors is an integer number (38675175357).

Almost surely, 2^221001002020 is an apocalyptic number.

221001002020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221001002020 is an abundant number, since it is smaller than the sum of its proper divisors (243101102264).

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

221001002020 is a wasteful number, since it uses less digits than its factorization.

221001002020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11050050110 (or 11050050108 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 221001002020 its reverse (20200100122), we get a palindrome (241201102142).

The spelling of 221001002020 in words is "two hundred twenty-one billion, one million, two thousand, twenty".