21133153 has 2 divisors, whose sum is σ = 21133154. Its totient is φ = 21133152.

The previous prime is 21133121. The next prime is 21133213. The reversal of 21133153 is 35133112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11751184 + 9381969 = 3428^2 + 3063^2 .

It is a cyclic number.

It is not a de Polignac number, because 21133153 - 2⁵ = 21133121 is a prime.

It is a super-2 number, since 2×21133153² = 893220311442818, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21133153.

It is not a weakly prime, because it can be changed into another prime (21133753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566576 + 10566577.

It is an arithmetic number, because the mean of its divisors is an integer number (10566577).

Almost surely, 2^21133153 is an apocalyptic number.

It is an amenable number.

21133153 is a deficient number, since it is larger than the sum of its proper divisors (1).

21133153 is an equidigital number, since it uses as much as digits as its factorization.

21133153 is an evil number, because the sum of its binary digits is even.

The product of its digits is 270, while the sum is 19.

The square root of 21133153 is about 4597.0809216284. The cubic root of 21133153 is about 276.4742991087.

Adding to 21133153 its reverse (35133112), we get a palindrome (56266265).

The spelling of 21133153 in words is "twenty-one million, one hundred thirty-three thousand, one hundred fifty-three".