2221202021 has 8 divisors (see below), whose sum is σ = 2229377304. Its totient is φ = 2213038080.

The previous prime is 2221201951. The next prime is 2221202029. The reversal of 2221202021 is 1202021222.

It can be written as a sum of positive squares in 4 ways, for example, as 204204100 + 2016997921 = 14290^2 + 44911^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2221202021 - 2¹⁰ = 2221200997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221201987 and 2221202005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221202029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 625511 + ... + 629051.

It is an arithmetic number, because the mean of its divisors is an integer number (278672163).

Almost surely, 2^2221202021 is an apocalyptic number.

It is an amenable number.

2221202021 is a deficient number, since it is larger than the sum of its proper divisors (8175283).

2221202021 is a wasteful number, since it uses less digits than its factorization.

2221202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5671.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 2221202021 is about 47129.6299688423. The cubic root of 2221202021 is about 1304.7561521844.

Adding to 2221202021 its reverse (1202021222), we get a palindrome (3423223243).

It can be divided in two parts, 222 and 1202021, that multiplied together give a palindrome (266848662).

The spelling of 2221202021 in words is "two billion, two hundred twenty-one million, two hundred two thousand, twenty-one".