121023111001 has 4 divisors (see below), whose sum is σ = 130332581092. Its totient is φ = 111713640912.

The previous prime is 121023110987. The next prime is 121023111017. The reversal of 121023111001 is 100111320121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100111320121 = 2179 ⋅45943699.

It can be written as a sum of positive squares in 2 ways, for example, as 80897011776 + 40126099225 = 284424^2 + 200315^2 .

It is a cyclic number.

It is not a de Polignac number, because 121023111001 - 2¹⁵ = 121023078233 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 9309470077 = 121023111001 / (1 + 2 + 1 + 0 + 2 + 3 + 1 + 1 + 1 + 0 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121023111031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4654735026 + ... + 4654735051.

It is an arithmetic number, because the mean of its divisors is an integer number (32583145273).

Almost surely, 2^121023111001 is an apocalyptic number.

It is an amenable number.

121023111001 is a deficient number, since it is larger than the sum of its proper divisors (9309470091).

121023111001 is an equidigital number, since it uses as much as digits as its factorization.

121023111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9309470090.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 121023111001 its reverse (100111320121), we get a palindrome (221134431122).

The spelling of 121023111001 in words is "one hundred twenty-one billion, twenty-three million, one hundred eleven thousand, one".