21120212020111 has 4 divisors (see below), whose sum is σ = 21325262622352. Its totient is φ = 20915161417872.

The previous prime is 21120212020097. The next prime is 21120212020121. The reversal of 21120212020111 is 11102021202112.

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 21120212020111 - 2³⁵ = 21085852281743 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 (21120212020121) 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, 102525300966 + ... + 102525301171.

It is an arithmetic number, because the mean of its divisors is an integer number (5331315655588).

Almost surely, 2^{21120212020111} is an apocalyptic number.

21120212020111 is a deficient number, since it is larger than the sum of its proper divisors (205050602241).

21120212020111 is a wasteful number, since it uses less digits than its factorization.

21120212020111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205050602240.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21120212020111 its reverse (11102021202112), we get a palindrome (32222233222223).

The spelling of 21120212020111 in words is "twenty-one trillion, one hundred twenty billion, two hundred twelve million, twenty thousand, one hundred eleven".