111210020021 has 4 divisors (see below), whose sum is σ = 111210709344. Its totient is φ = 111209330700.

The previous prime is 111210019933. The next prime is 111210020039. The reversal of 111210020021 is 120020012111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 120020012111 = 547 ⋅219415013.

It is a cyclic number.

It is not a de Polignac number, because 111210020021 - 2¹⁴ = 111210003637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111210019984 and 111210020011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111210020321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41726 + ... + 473456.

It is an arithmetic number, because the mean of its divisors is an integer number (27802677336).

Almost surely, 2^111210020021 is an apocalyptic number.

It is an amenable number.

111210020021 is a deficient number, since it is larger than the sum of its proper divisors (689323).

111210020021 is an equidigital number, since it uses as much as digits as its factorization.

111210020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689322.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 111210020021 its reverse (120020012111), we get a palindrome (231230032132).

The spelling of 111210020021 in words is "one hundred eleven billion, two hundred ten million, twenty thousand, twenty-one".