20120120021111 has 4 divisors (see below), whose sum is σ = 21949221841224. Its totient is φ = 18291018201000.

The previous prime is 20120120021087. The next prime is 20120120021117. The reversal of 20120120021111 is 11112002102102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20120120021111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120120021117) 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, 914550910040 + ... + 914550910061.

It is an arithmetic number, because the mean of its divisors is an integer number (5487305460306).

Almost surely, 2^{20120120021111} is an apocalyptic number.

20120120021111 is a deficient number, since it is larger than the sum of its proper divisors (1829101820113).

20120120021111 is a wasteful number, since it uses less digits than its factorization.

20120120021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1829101820112.

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

Adding to 20120120021111 its reverse (11112002102102), we get a palindrome (31232122123213).

The spelling of 20120120021111 in words is "twenty trillion, one hundred twenty billion, one hundred twenty million, twenty-one thousand, one hundred eleven".