20110101221021 has 4 divisors (see below), whose sum is σ = 22982972824032. Its totient is φ = 17237229618012.

The previous prime is 20110101220981. The next prime is 20110101221039. The reversal of 20110101221021 is 12012210101102.

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 20110101221021 - 2¹⁴ = 20110101204637 is a prime.

It is a super-2 number, since 2×20110101221021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20110101220987 and 20110101221005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110101221051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1436435801495 + ... + 1436435801508.

It is an arithmetic number, because the mean of its divisors is an integer number (5745743206008).

Almost surely, 2^{20110101221021} is an apocalyptic number.

It is an amenable number.

20110101221021 is a deficient number, since it is larger than the sum of its proper divisors (2872871603011).

20110101221021 is an equidigital number, since it uses as much as digits as its factorization.

20110101221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2872871603010.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20110101221021 its reverse (12012210101102), we get a palindrome (32122311322123).

The spelling of 20110101221021 in words is "twenty trillion, one hundred ten billion, one hundred one million, two hundred twenty-one thousand, twenty-one".