2021010020221 has 4 divisors (see below), whose sum is σ = 2040631476832. Its totient is φ = 2001388563612.

The previous prime is 2021010020207. The next prime is 2021010020233. The reversal of 2021010020221 is 1220200101202.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 2021010020221 - 2⁷ = 2021010020093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021010020291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9810728151 + ... + 9810728356.

It is an arithmetic number, because the mean of its divisors is an integer number (510157869208).

Almost surely, 2^{2021010020221} is an apocalyptic number.

It is an amenable number.

2021010020221 is a deficient number, since it is larger than the sum of its proper divisors (19621456611).

2021010020221 is a wasteful number, since it uses less digits than its factorization.

2021010020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19621456610.

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

Adding to 2021010020221 its reverse (1220200101202), we get a palindrome (3241210121423).

The spelling of 2021010020221 in words is "two trillion, twenty-one billion, ten million, twenty thousand, two hundred twenty-one".