21101153 has 4 divisors (see below), whose sum is σ = 22211760. Its totient is φ = 19990548.

The previous prime is 21101123. The next prime is 21101207. The reversal of 21101153 is 35110112.

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 21101153 - 2¹⁰ = 21100129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21101123) 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, 555275 + ... + 555312.

It is an arithmetic number, because the mean of its divisors is an integer number (5552940).

Almost surely, 2^21101153 is an apocalyptic number.

It is an amenable number.

21101153 is a deficient number, since it is larger than the sum of its proper divisors (1110607).

21101153 is a wasteful number, since it uses less digits than its factorization.

21101153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110606.

The product of its (nonzero) digits is 30, while the sum is 14.

The square root of 21101153 is about 4593.5991335771. The cubic root of 21101153 is about 276.3346820369.

Adding to 21101153 its reverse (35110112), we get a palindrome (56211265).

The spelling of 21101153 in words is "twenty-one million, one hundred one thousand, one hundred fifty-three".