111001220120021 has 8 divisors (see below), whose sum is σ = 138391131578304. Its totient is φ = 86494457236320.

The previous prime is 111001220120017. The next prime is 111001220120051. The reversal of 111001220120021 is 120021022100111.

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

It is not a de Polignac number, because 111001220120021 - 2² = 111001220120017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111001220119978 and 111001220120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111001220120051) 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, 720787143560 + ... + 720787143713.

It is an arithmetic number, because the mean of its divisors is an integer number (17298891447288).

Almost surely, 2^{111001220120021} is an apocalyptic number.

111001220120021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111001220120021 is a deficient number, since it is larger than the sum of its proper divisors (27389911458283).

111001220120021 is a wasteful number, since it uses less digits than its factorization.

111001220120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1441574287291.

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

Adding to 111001220120021 its reverse (120021022100111), we get a palindrome (231022242220132).

The spelling of 111001220120021 in words is "one hundred eleven trillion, one billion, two hundred twenty million, one hundred twenty thousand, twenty-one".