111021121100021 has 16 divisors (see below), whose sum is σ = 122563403289600. Its totient is φ = 99727296908400.

The previous prime is 111021121100011. The next prime is 111021121100041. The reversal of 111021121100021 is 120001121120111.

It is a cyclic number.

It is not a de Polignac number, because 111021121100021 - 2⁶ = 111021121099957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111021121099969 and 111021121100005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111021121100011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171739661 + ... + 172384898.

It is an arithmetic number, because the mean of its divisors is an integer number (7660212705600).

Almost surely, 2^{111021121100021} is an apocalyptic number.

111021121100021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111021121100021 is a deficient number, since it is larger than the sum of its proper divisors (11542282189579).

111021121100021 is a wasteful number, since it uses less digits than its factorization.

111021121100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344124920.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 111021121100021 its reverse (120001121120111), we get a palindrome (231022242220132).

The spelling of 111021121100021 in words is "one hundred eleven trillion, twenty-one billion, one hundred twenty-one million, one hundred thousand, twenty-one".