111021100021 has 32 divisors (see below), whose sum is σ = 122983660800. Its totient is φ = 99574272000.

The previous prime is 111021099979. The next prime is 111021100033. The reversal of 111021100021 is 120001120111.

It is a cyclic number.

It is not a de Polignac number, because 111021100021 - 2¹⁹ = 111020575733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111021099980 and 111021100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111021100321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 158374971 + ... + 158375671.

It is an arithmetic number, because the mean of its divisors is an integer number (3843239400).

Almost surely, 2^111021100021 is an apocalyptic number.

It is an amenable number.

111021100021 is a deficient number, since it is larger than the sum of its proper divisors (11962560779).

111021100021 is a wasteful number, since it uses less digits than its factorization.

111021100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1837.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 111021100021 its reverse (120001120111), we get a palindrome (231022220132).

The spelling of 111021100021 in words is "one hundred eleven billion, twenty-one million, one hundred thousand, twenty-one".