20012121121001 has 4 divisors (see below), whose sum is σ = 21189304716372. Its totient is φ = 18834937525632.

The previous prime is 20012121120949. The next prime is 20012121121033. The reversal of 20012121121001 is 10012112121002.

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 12254893488601 + 7757227632400 = 3500699^2 + 2785180^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012121121001 - 2³⁸ = 19737243214057 is a prime.

It is a super-2 number, since 2×20012121121001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20012121121061) 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, 588591797660 + ... + 588591797693.

It is an arithmetic number, because the mean of its divisors is an integer number (5297326179093).

Almost surely, 2^{20012121121001} is an apocalyptic number.

It is an amenable number.

20012121121001 is a deficient number, since it is larger than the sum of its proper divisors (1177183595371).

20012121121001 is a wasteful number, since it uses less digits than its factorization.

20012121121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177183595370.

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

Adding to 20012121121001 its reverse (10012112121002), we get a palindrome (30024233242003).

It can be divided in two parts, 2001212 and 1121001, that added together give a palindrome (3122213).

The spelling of 20012121121001 in words is "twenty trillion, twelve billion, one hundred twenty-one million, one hundred twenty-one thousand, one".