20110101122021 has 4 divisors (see below), whose sum is σ = 20294597462700. Its totient is φ = 19925604781344.

The previous prime is 20110101122011. The next prime is 20110101122081. The reversal of 20110101122021 is 12022110101102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9255619713025 + 10854481408996 = 3042305^2 + 3294614^2 .

It is a cyclic number.

It is not a de Polignac number, because 20110101122021 - 2³⁴ = 20092921252837 is a prime.

It is a super-2 number, since 2×20110101122021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20110101121987 and 20110101122005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110101122011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92248170176 + ... + 92248170393.

It is an arithmetic number, because the mean of its divisors is an integer number (5073649365675).

Almost surely, 2^{20110101122021} is an apocalyptic number.

It is an amenable number.

20110101122021 is a deficient number, since it is larger than the sum of its proper divisors (184496340679).

20110101122021 is a wasteful number, since it uses less digits than its factorization.

20110101122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184496340678.

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

Adding to 20110101122021 its reverse (12022110101102), we get a palindrome (32132211223123).

The spelling of 20110101122021 in words is "twenty trillion, one hundred ten billion, one hundred one million, one hundred twenty-two thousand, twenty-one".