21120020120111 has 8 divisors (see below), whose sum is σ = 23040141069648. Its totient is φ = 19199919024000.

The previous prime is 21120020120107. The next prime is 21120020120167. The reversal of 21120020120111 is 11102102002112.

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

It is not a de Polignac number, because 21120020120111 - 2² = 21120020120107 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 (21120020125111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2693930 + ... + 7035431.

It is an arithmetic number, because the mean of its divisors is an integer number (2880017633706).

Almost surely, 2^{21120020120111} is an apocalyptic number.

21120020120111 is a deficient number, since it is larger than the sum of its proper divisors (1920120949537).

21120020120111 is a wasteful number, since it uses less digits than its factorization.

21120020120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9926713.

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

Adding to 21120020120111 its reverse (11102102002112), we get a palindrome (32222122122223).

The spelling of 21120020120111 in words is "twenty-one trillion, one hundred twenty billion, twenty million, one hundred twenty thousand, one hundred eleven".