20212121012111 has 8 divisors (see below), whose sum is σ = 23662970941344. Its totient is φ = 16902122100480.

The previous prime is 20212121012071. The next prime is 20212121012143. The reversal of 20212121012111 is 11121012121202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20212121012111 - 2¹⁰ = 20212121011087 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20212121012111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212121012911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35212754090 + ... + 35212754663.

It is an arithmetic number, because the mean of its divisors is an integer number (2957871367668).

Almost surely, 2^{20212121012111} is an apocalyptic number.

20212121012111 is a deficient number, since it is larger than the sum of its proper divisors (3450849929233).

20212121012111 is an equidigital number, since it uses as much as digits as its factorization.

20212121012111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70425508801.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 20212121012111 its reverse (11121012121202), we get a palindrome (31333133133313).

The spelling of 20212121012111 in words is "twenty trillion, two hundred twelve billion, one hundred twenty-one million, twelve thousand, one hundred eleven".