121011012421 has 8 divisors (see below), whose sum is σ = 130325370840. Its totient is φ = 111697485312.

The previous prime is 121011012391. The next prime is 121011012449. The reversal of 121011012421 is 124210110121.

It can be written as a sum of positive squares in 4 ways, for example, as 4122924100 + 116888088321 = 64210^2 + 341889^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121011012421 - 2⁹ = 121011011909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121011012395 and 121011012404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121011013421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112845 + ... + 504733.

It is an arithmetic number, because the mean of its divisors is an integer number (16290671355).

Almost surely, 2^121011012421 is an apocalyptic number.

It is an amenable number.

121011012421 is a deficient number, since it is larger than the sum of its proper divisors (9314358419).

121011012421 is a wasteful number, since it uses less digits than its factorization.

121011012421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415655.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121011012421 its reverse (124210110121), we get a palindrome (245221122542).

The spelling of 121011012421 in words is "one hundred twenty-one billion, eleven million, twelve thousand, four hundred twenty-one".