121131421 has 8 divisors (see below), whose sum is σ = 124342488. Its totient is φ = 117960000.

The previous prime is 121131407. The next prime is 121131431. The reversal of 121131421 is 124131121.

It can be written as a sum of positive squares in 4 ways, for example, as 19404025 + 101727396 = 4405^2 + 10086^2 .

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 121131421 - 2⁷ = 121131293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121131395 and 121131404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121131431) 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, 3670 + ... + 15991.

It is an arithmetic number, because the mean of its divisors is an integer number (15542811).

Almost surely, 2^121131421 is an apocalyptic number.

It is an amenable number.

121131421 is a deficient number, since it is larger than the sum of its proper divisors (3211067).

121131421 is a wasteful number, since it uses less digits than its factorization.

121131421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19823.

The product of its digits is 48, while the sum is 16.

The square root of 121131421 is about 11005.9720606587. The cubic root of 121131421 is about 494.7877483375.

Adding to 121131421 its reverse (124131121), we get a palindrome (245262542).

The spelling of 121131421 in words is "one hundred twenty-one million, one hundred thirty-one thousand, four hundred twenty-one".