1010020021221 has 4 divisors (see below), whose sum is σ = 1346693361632. Its totient is φ = 673346680812.

The previous prime is 1010020021151. The next prime is 1010020021247. The reversal of 1010020021221 is 1221200200101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1010020021221 - 2²³ = 1010011632613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1010020021197 and 1010020021206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1010020020221) 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, 168336670201 + ... + 168336670206.

It is an arithmetic number, because the mean of its divisors is an integer number (336673340408).

Almost surely, 2^{1010020021221} is an apocalyptic number.

It is an amenable number.

1010020021221 is a deficient number, since it is larger than the sum of its proper divisors (336673340411).

1010020021221 is an equidigital number, since it uses as much as digits as its factorization.

1010020021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336673340410.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1010020021221 its reverse (1221200200101), we get a palindrome (2231220221322).

The spelling of 1010020021221 in words is "one trillion, ten billion, twenty million, twenty-one thousand, two hundred twenty-one".