21332053 has 2 divisors, whose sum is σ = 21332054. Its totient is φ = 21332052.

The previous prime is 21332029. The next prime is 21332057. The reversal of 21332053 is 35023312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12439729 + 8892324 = 3527^2 + 2982^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21332053 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21332053.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21332057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10666026 + 10666027.

It is an arithmetic number, because the mean of its divisors is an integer number (10666027).

Almost surely, 2^21332053 is an apocalyptic number.

It is an amenable number.

21332053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21332053 is an equidigital number, since it uses as much as digits as its factorization.

21332053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 19.

The square root of 21332053 is about 4618.6635512884. The cubic root of 21332053 is about 277.3389612946.

Adding to 21332053 its reverse (35023312), we get a palindrome (56355365).

It can be divided in two parts, 2133 and 2053, that added together give a triangular number (4186 = T₉₁).

The spelling of 21332053 in words is "twenty-one million, three hundred thirty-two thousand, fifty-three".