111121220021001 has 4 divisors (see below), whose sum is σ = 148161626694672. Its totient is φ = 74080813347332.

The previous prime is 111121220020973. The next prime is 111121220021003. The reversal of 111121220021001 is 100120022121111.

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 111121220021001 - 2⁵ = 111121220020969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111121220021003) 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, 18520203336831 + ... + 18520203336836.

It is an arithmetic number, because the mean of its divisors is an integer number (37040406673668).

Almost surely, 2^{111121220021001} is an apocalyptic number.

It is an amenable number.

111121220021001 is a deficient number, since it is larger than the sum of its proper divisors (37040406673671).

111121220021001 is an equidigital number, since it uses as much as digits as its factorization.

111121220021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37040406673670.

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

Adding to 111121220021001 its reverse (100120022121111), we get a palindrome (211241242142112).

The spelling of 111121220021001 in words is "one hundred eleven trillion, one hundred twenty-one billion, two hundred twenty million, twenty-one thousand, one".