100111012221021 has 4 divisors (see below), whose sum is σ = 133481349628032. Its totient is φ = 66740674814012.

The previous prime is 100111012220953. The next prime is 100111012221043. The reversal of 100111012221021 is 120122210111001.

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 100111012221021 - 2⁹ = 100111012220509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100111012221071) 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, 16685168703501 + ... + 16685168703506.

It is an arithmetic number, because the mean of its divisors is an integer number (33370337407008).

Almost surely, 2^{100111012221021} is an apocalyptic number.

It is an amenable number.

100111012221021 is a deficient number, since it is larger than the sum of its proper divisors (33370337407011).

100111012221021 is an equidigital number, since it uses as much as digits as its factorization.

100111012221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33370337407010.

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

Adding to 100111012221021 its reverse (120122210111001), we get a palindrome (220233222332022).

The spelling of 100111012221021 in words is "one hundred trillion, one hundred eleven billion, twelve million, two hundred twenty-one thousand, twenty-one".