20021201021111 has 4 divisors (see below), whose sum is σ = 20174034616824. Its totient is φ = 19868367425400.

The previous prime is 20021201021077. The next prime is 20021201021153. The reversal of 20021201021111 is 11112010212002.

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

It is a cyclic number.

It is not a de Polignac number, because 20021201021111 - 2⁶ = 20021201021047 is a prime.

It is a super-2 number, since 2×20021201021111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021201021191) 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, 76416797660 + ... + 76416797921.

It is an arithmetic number, because the mean of its divisors is an integer number (5043508654206).

Almost surely, 2^{20021201021111} is an apocalyptic number.

20021201021111 is a deficient number, since it is larger than the sum of its proper divisors (152833595713).

20021201021111 is a wasteful number, since it uses less digits than its factorization.

20021201021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152833595712.

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

Adding to 20021201021111 its reverse (11112010212002), we get a palindrome (31133211233113).

The spelling of 20021201021111 in words is "twenty trillion, twenty-one billion, two hundred one million, twenty-one thousand, one hundred eleven".