20102221211021 has 8 divisors (see below), whose sum is σ = 20277862443384. Its totient is φ = 19927289640960.

The previous prime is 20102221210957. The next prime is 20102221211041. The reversal of 20102221211021 is 12011212220102.

It can be written as a sum of positive squares in 4 ways, for example, as 126586524100 + 19975634686921 = 355790^2 + 4469411^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20102221211021 - 2⁶ = 20102221210957 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 (20102221211041) 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, 177358676 + ... + 177471981.

It is an arithmetic number, because the mean of its divisors is an integer number (2534732805423).

Almost surely, 2^{20102221211021} is an apocalyptic number.

It is an amenable number.

20102221211021 is a deficient number, since it is larger than the sum of its proper divisors (175641232363).

20102221211021 is a wasteful number, since it uses less digits than its factorization.

20102221211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354831151.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20102221211021 its reverse (12011212220102), we get a palindrome (32113433431123).

The spelling of 20102221211021 in words is "twenty trillion, one hundred two billion, two hundred twenty-one million, two hundred eleven thousand, twenty-one".