111201121020021 has 4 divisors (see below), whose sum is σ = 148268161360032. Its totient is φ = 74134080680012.

The previous prime is 111201121019977. The next prime is 111201121020037. The reversal of 111201121020021 is 120020121102111.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 111201121020021 - 2³⁰ = 111200047278197 is a prime.

It is a super-2 number, since 2×111201121020021² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111201121020071) 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, 18533520170001 + ... + 18533520170006.

It is an arithmetic number, because the mean of its divisors is an integer number (37067040340008).

Almost surely, 2^{111201121020021} is an apocalyptic number.

It is an amenable number.

111201121020021 is a deficient number, since it is larger than the sum of its proper divisors (37067040340011).

111201121020021 is an equidigital number, since it uses as much as digits as its factorization.

111201121020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37067040340010.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111201121020021 its reverse (120020121102111), we get a palindrome (231221242122132).

The spelling of 111201121020021 in words is "one hundred eleven trillion, two hundred one billion, one hundred twenty-one million, twenty thousand, twenty-one".