20021200011111 has 12 divisors (see below), whose sum is σ = 28906347945768. Its totient is φ = 12320738468064.

The previous prime is 20021200011089. The next prime is 20021200011139. The reversal of 20021200011111 is 11111000212002.

It is not a de Polignac number, because 20021200011111 - 2⁵ = 20021200011079 is a prime.

It is a super-2 number, since 2×20021200011111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021208011111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19744772680 + ... + 19744773693.

It is an arithmetic number, because the mean of its divisors is an integer number (2408862328814).

Almost surely, 2^{20021200011111} is an apocalyptic number.

20021200011111 is a deficient number, since it is larger than the sum of its proper divisors (8885147934657).

20021200011111 is a wasteful number, since it uses less digits than its factorization.

20021200011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39489546402 (or 39489546389 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20021200011111 its reverse (11111000212002), we get a palindrome (31132200223113).

The spelling of 20021200011111 in words is "twenty trillion, twenty-one billion, two hundred million, eleven thousand, one hundred eleven".