21053042033 has 2 divisors, whose sum is σ = 21053042034. Its totient is φ = 21053042032.

The previous prime is 21053041987. The next prime is 21053042051. The reversal of 21053042033 is 33024035012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16839474289 + 4213567744 = 129767^2 + 64912^2 .

It is a cyclic number.

It is not a de Polignac number, because 21053042033 - 2³² = 16758074737 is a prime.

It is not a weakly prime, because it can be changed into another prime (21053042083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10526521016 + 10526521017.

It is an arithmetic number, because the mean of its divisors is an integer number (10526521017).

Almost surely, 2^21053042033 is an apocalyptic number.

It is an amenable number.

21053042033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21053042033 is an equidigital number, since it uses as much as digits as its factorization.

21053042033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 23.

Adding to 21053042033 its reverse (33024035012), we get a palindrome (54077077045).

The spelling of 21053042033 in words is "twenty-one billion, fifty-three million, forty-two thousand, thirty-three".