220102201021 has 4 divisors (see below), whose sum is σ = 220103876700. Its totient is φ = 220100525344.

The previous prime is 220102201003. The next prime is 220102201051. The reversal of 220102201021 is 120102201022.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 105865636900 + 114236564121 = 325370^2 + 337989^2 .

It is a cyclic number.

It is not a de Polignac number, because 220102201021 - 2⁹ = 220102200509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220102200992 and 220102201010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220102201051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 622336 + ... + 909673.

It is an arithmetic number, because the mean of its divisors is an integer number (55025969175).

Almost surely, 2^220102201021 is an apocalyptic number.

It is an amenable number.

220102201021 is a deficient number, since it is larger than the sum of its proper divisors (1675679).

220102201021 is a wasteful number, since it uses less digits than its factorization.

220102201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1675678.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 220102201021 its reverse (120102201022), we get a palindrome (340204402043).

Subtracting from 220102201021 its reverse (120102201022), we obtain a palindrome (99999999999).

The spelling of 220102201021 in words is "two hundred twenty billion, one hundred two million, two hundred one thousand, twenty-one".