121003121110021 has 4 divisors (see below), whose sum is σ = 121150147989472. Its totient is φ = 120856094230572.

The previous prime is 121003121110007. The next prime is 121003121110057. The reversal of 121003121110021 is 120011121300121.

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 121003121110021 - 2⁹ = 121003121109509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121003121109977 and 121003121110004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121003121110121) 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, 73513438491 + ... + 73513440136.

It is an arithmetic number, because the mean of its divisors is an integer number (30287536997368).

Almost surely, 2^{121003121110021} is an apocalyptic number.

It is an amenable number.

121003121110021 is a deficient number, since it is larger than the sum of its proper divisors (147026879451).

121003121110021 is an equidigital number, since it uses as much as digits as its factorization.

121003121110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147026879450.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 121003121110021 its reverse (120011121300121), we get a palindrome (241014242410142).

The spelling of 121003121110021 in words is "one hundred twenty-one trillion, three billion, one hundred twenty-one million, one hundred ten thousand, twenty-one".