21035121 has 8 divisors (see below), whose sum is σ = 29014080. Its totient is φ = 13539792.

The previous prime is 21035111. The next prime is 21035123. The reversal of 21035121 is 12153012.

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

It is not a de Polignac number, because 21035121 - 2⁹ = 21034609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21035121.

It is not an unprimeable number, because it can be changed into a prime (21035123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120805 + ... + 120978.

It is an arithmetic number, because the mean of its divisors is an integer number (3626760).

Almost surely, 2^21035121 is an apocalyptic number.

It is an amenable number.

21035121 is a deficient number, since it is larger than the sum of its proper divisors (7978959).

21035121 is a wasteful number, since it uses less digits than its factorization.

21035121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241815.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 21035121 is about 4586.4061093628. The cubic root of 21035121 is about 276.0461354299.

Adding to 21035121 its reverse (12153012), we get a palindrome (33188133).

The spelling of 21035121 in words is "twenty-one million, thirty-five thousand, one hundred twenty-one".