21061153 has 2 divisors, whose sum is σ = 21061154. Its totient is φ = 21061152.

The previous prime is 21061129. The next prime is 21061207. The reversal of 21061153 is 35116012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11370384 + 9690769 = 3372^2 + 3113^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21061153 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21061153.

It is not a weakly prime, because it can be changed into another prime (21065153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10530576 + 10530577.

It is an arithmetic number, because the mean of its divisors is an integer number (10530577).

Almost surely, 2^21061153 is an apocalyptic number.

It is an amenable number.

21061153 is a deficient number, since it is larger than the sum of its proper divisors (1).

21061153 is an equidigital number, since it uses as much as digits as its factorization.

21061153 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 21061153 is about 4589.2431837940. The cubic root of 21061153 is about 276.1599620579.

Adding to 21061153 its reverse (35116012), we get a palindrome (56177165).

The spelling of 21061153 in words is "twenty-one million, sixty-one thousand, one hundred fifty-three".