20100221011021 has 8 divisors (see below), whose sum is σ = 20160132403320. Its totient is φ = 20040311198208.

The previous prime is 20100221010983. The next prime is 20100221011049. The reversal of 20100221011021 is 12011012200102.

It can be written as a sum of positive squares in 4 ways, for example, as 1282757842921 + 18817463168100 = 1132589^2 + 4337910^2 .

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 20100221011021 - 2⁷ = 20100221010893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20100221010992 and 20100221011010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100221011061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28167585 + ... + 28872361.

It is an arithmetic number, because the mean of its divisors is an integer number (2520016550415).

Almost surely, 2^{20100221011021} is an apocalyptic number.

It is an amenable number.

20100221011021 is a deficient number, since it is larger than the sum of its proper divisors (59911392299).

20100221011021 is an equidigital number, since it uses as much as digits as its factorization.

20100221011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789743.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20100221011021 its reverse (12011012200102), we get a palindrome (32111233211123).

The spelling of 20100221011021 in words is "twenty trillion, one hundred billion, two hundred twenty-one million, eleven thousand, twenty-one".