20020201021221 has 4 divisors (see below), whose sum is σ = 26693601361632. Its totient is φ = 13346800680812.

The previous prime is 20020201021199. The next prime is 20020201021291. The reversal of 20020201021221 is 12212010202002.

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 20020201021221 - 2²⁷ = 20020066803493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20020201021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020201021291) 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, 3336700170201 + ... + 3336700170206.

It is an arithmetic number, because the mean of its divisors is an integer number (6673400340408).

Almost surely, 2^{20020201021221} is an apocalyptic number.

It is an amenable number.

20020201021221 is a deficient number, since it is larger than the sum of its proper divisors (6673400340411).

20020201021221 is an equidigital number, since it uses as much as digits as its factorization.

20020201021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6673400340410.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20020201021221 its reverse (12212010202002), we get a palindrome (32232211223223).

The spelling of 20020201021221 in words is "twenty trillion, twenty billion, two hundred one million, twenty-one thousand, two hundred twenty-one".