2221001020 has 24 divisors (see below), whose sum is σ = 5330402784. Its totient is φ = 761486016.

The previous prime is 2221001011. The next prime is 2221001053. The reversal of 2221001020 is 201001222.

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 = 2221000988 and 2221001006.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7932007 + ... + 7932286.

It is an arithmetic number, because the mean of its divisors is an integer number (222100116).

Almost surely, 2^2221001020 is an apocalyptic number.

2221001020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2221001020 is an abundant number, since it is smaller than the sum of its proper divisors (3109401764).

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

2221001020 is a wasteful number, since it uses less digits than its factorization.

2221001020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15864309 (or 15864307 counting only the distinct ones).

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

The square root of 2221001020 is about 47127.4974935016. The cubic root of 2221001020 is about 1304.7167943353.

Adding to 2221001020 its reverse (201001222), we get a palindrome (2422002242).

The spelling of 2221001020 in words is "two billion, two hundred twenty-one million, one thousand, twenty".