121011421 has 4 divisors (see below), whose sum is σ = 121235644. Its totient is φ = 120787200.

The previous prime is 121011413. The next prime is 121011463. The reversal of 121011421 is 124110121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124110121 = 3617 ⋅34313.

It can be written as a sum of positive squares in 2 ways, for example, as 42068196 + 78943225 = 6486^2 + 8885^2 .

It is a cyclic number.

It is not a de Polignac number, because 121011421 - 2³ = 121011413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021421) 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, 111300 + ... + 112381.

It is an arithmetic number, because the mean of its divisors is an integer number (30308911).

Almost surely, 2^121011421 is an apocalyptic number.

It is an amenable number.

121011421 is a deficient number, since it is larger than the sum of its proper divisors (224223).

121011421 is an equidigital number, since it uses as much as digits as its factorization.

121011421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224222.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 121011421 is about 11000.5191241141. The cubic root of 121011421 is about 494.6243056162.

Adding to 121011421 its reverse (124110121), we get a palindrome (245121542).

The spelling of 121011421 in words is "one hundred twenty-one million, eleven thousand, four hundred twenty-one".