20010002010221 has 4 divisors (see below), whose sum is σ = 20012448528000. Its totient is φ = 20007555492444.

The previous prime is 20010002010169. The next prime is 20010002010233. The reversal of 20010002010221 is 12201020001002.

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 20010002010221 - 2¹⁰ = 20010002009197 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 (20010002010421) 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, 1223246621 + ... + 1223262978.

It is an arithmetic number, because the mean of its divisors is an integer number (5003112132000).

Almost surely, 2^{20010002010221} is an apocalyptic number.

It is an amenable number.

20010002010221 is a deficient number, since it is larger than the sum of its proper divisors (2446517779).

20010002010221 is an equidigital number, since it uses as much as digits as its factorization.

20010002010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2446517778.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20010002010221 its reverse (12201020001002), we get a palindrome (32211022011223).

The spelling of 20010002010221 in words is "twenty trillion, ten billion, two million, ten thousand, two hundred twenty-one".