20110121012021 has 8 divisors (see below), whose sum is σ = 20283309435480. Its totient is φ = 19937643835392.

The previous prime is 20110121011993. The next prime is 20110121012029. The reversal of 20110121012021 is 12021012101102.

It can be written as a sum of positive squares in 4 ways, for example, as 11984827771921 + 8125293240100 = 3461911^2 + 2850490^2 .

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-20110121012021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20110121011987 and 20110121012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110121012029) 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, 177754916 + ... + 177868013.

It is an arithmetic number, because the mean of its divisors is an integer number (2535413679435).

Almost surely, 2^{20110121012021} is an apocalyptic number.

It is an amenable number.

20110121012021 is a deficient number, since it is larger than the sum of its proper divisors (173188423459).

20110121012021 is a wasteful number, since it uses less digits than its factorization.

20110121012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355623415.

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

Adding to 20110121012021 its reverse (12021012101102), we get a palindrome (32131133113123).

The spelling of 20110121012021 in words is "twenty trillion, one hundred ten billion, one hundred twenty-one million, twelve thousand, twenty-one".