21035153 has 4 divisors (see below), whose sum is σ = 21161280. Its totient is φ = 20909028.

The previous prime is 21035149. The next prime is 21035159. The reversal of 21035153 is 35153012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21035153 - 2² = 21035149 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21035159) 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, 62813 + ... + 63146.

It is an arithmetic number, because the mean of its divisors is an integer number (5290320).

Almost surely, 2^21035153 is an apocalyptic number.

It is an amenable number.

21035153 is a deficient number, since it is larger than the sum of its proper divisors (126127).

21035153 is a wasteful number, since it uses less digits than its factorization.

21035153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126126.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 21035153 is about 4586.4095979317. The cubic root of 21035153 is about 276.0462754096.

Adding to 21035153 its reverse (35153012), we get a palindrome (56188165).

The spelling of 21035153 in words is "twenty-one million, thirty-five thousand, one hundred fifty-three".