121373821 has 8 divisors (see below), whose sum is σ = 125430624. Its totient is φ = 117373200.

The previous prime is 121373807. The next prime is 121373851. The reversal of 121373821 is 128373121.

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 121373821 - 2¹⁷ = 121242749 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121373821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121373851) 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, 9631 + ... + 18316.

It is an arithmetic number, because the mean of its divisors is an integer number (15678828).

Almost surely, 2^121373821 is an apocalyptic number.

It is an amenable number.

121373821 is a deficient number, since it is larger than the sum of its proper divisors (4056803).

121373821 is a wasteful number, since it uses less digits than its factorization.

121373821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28091.

The product of its digits is 2016, while the sum is 28.

The square root of 121373821 is about 11016.9787600776. The cubic root of 121373821 is about 495.1175736767.

The spelling of 121373821 in words is "one hundred twenty-one million, three hundred seventy-three thousand, eight hundred twenty-one".