20110021020121 has 4 divisors (see below), whose sum is σ = 20111055133312. Its totient is φ = 20108986906932.

The previous prime is 20110021020077. The next prime is 20110021020139. The reversal of 20110021020121 is 12102012001102.

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 20110021020121 - 2¹⁹ = 20110020495833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20110021020191) 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, 517027425 + ... + 517066318.

It is an arithmetic number, because the mean of its divisors is an integer number (5027763783328).

Almost surely, 2^{20110021020121} is an apocalyptic number.

It is an amenable number.

20110021020121 is a deficient number, since it is larger than the sum of its proper divisors (1034113191).

20110021020121 is a wasteful number, since it uses less digits than its factorization.

20110021020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034113190.

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

Adding to 20110021020121 its reverse (12102012001102), we get a palindrome (32212033021223).

The spelling of 20110021020121 in words is "twenty trillion, one hundred ten billion, twenty-one million, twenty thousand, one hundred twenty-one".