111001010021 has 4 divisors (see below), whose sum is σ = 121092010944. Its totient is φ = 100910009100.

The previous prime is 111001010017. The next prime is 111001010053. The reversal of 111001010021 is 120010100111.

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 111001010021 - 2² = 111001010017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111001009990 and 111001010008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111001010321) 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, 5045500445 + ... + 5045500466.

It is an arithmetic number, because the mean of its divisors is an integer number (30273002736).

Almost surely, 2^111001010021 is an apocalyptic number.

111001010021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111001010021 is a deficient number, since it is larger than the sum of its proper divisors (10091000923).

111001010021 is a wasteful number, since it uses less digits than its factorization.

111001010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10091000922.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 111001010021 its reverse (120010100111), we get a palindrome (231011110132).

The spelling of 111001010021 in words is "one hundred eleven billion, one million, ten thousand, twenty-one".