21411153 has 12 divisors (see below), whose sum is σ = 30974580. Its totient is φ = 14252256.

The previous prime is 21411149. The next prime is 21411161. The reversal of 21411153 is 35111412.

It can be written as a sum of positive squares in 2 ways, for example, as 6411024 + 15000129 = 2532^2 + 3873^2 .

It is not a de Polignac number, because 21411153 - 2² = 21411149 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21411253) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6283 + ... + 9071.

It is an arithmetic number, because the mean of its divisors is an integer number (2581215).

Almost surely, 2^21411153 is an apocalyptic number.

It is an amenable number.

21411153 is a deficient number, since it is larger than the sum of its proper divisors (9563427).

21411153 is a wasteful number, since it uses less digits than its factorization.

21411153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3648 (or 3645 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 21411153 is about 4627.2187110618. The cubic root of 21411153 is about 277.6813326631.

Adding to 21411153 its reverse (35111412), we get a palindrome (56522565).

The spelling of 21411153 in words is "twenty-one million, four hundred eleven thousand, one hundred fifty-three".