20021202021221 has 8 divisors (see below), whose sum is σ = 20798684496384. Its totient is φ = 19251946874160.

The previous prime is 20021202021199. The next prime is 20021202021229. The reversal of 20021202021221 is 12212020212002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021202021221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20021202021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021202021229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2056827065 + ... + 2056836798.

It is an arithmetic number, because the mean of its divisors is an integer number (2599835562048).

Almost surely, 2^{20021202021221} is an apocalyptic number.

It is an amenable number.

20021202021221 is a deficient number, since it is larger than the sum of its proper divisors (777482475163).

20021202021221 is a wasteful number, since it uses less digits than its factorization.

20021202021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4113664051.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20021202021221 its reverse (12212020212002), we get a palindrome (32233222233223).

The spelling of 20021202021221 in words is "twenty trillion, twenty-one billion, two hundred two million, twenty-one thousand, two hundred twenty-one".