21541031053 has 2 divisors, whose sum is σ = 21541031054. Its totient is φ = 21541031052.

The previous prime is 21541031047. The next prime is 21541031069. The reversal of 21541031053 is 35013014512.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19426226884 + 2114804169 = 139378^2 + 45987^2 .

It is a cyclic number.

It is not a de Polignac number, because 21541031053 - 2⁵ = 21541031021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21541031033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10770515526 + 10770515527.

It is an arithmetic number, because the mean of its divisors is an integer number (10770515527).

Almost surely, 2^21541031053 is an apocalyptic number.

It is an amenable number.

21541031053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21541031053 is an equidigital number, since it uses as much as digits as its factorization.

21541031053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 21541031053 its reverse (35013014512), we get a palindrome (56554045565).

The spelling of 21541031053 in words is "twenty-one billion, five hundred forty-one million, thirty-one thousand, fifty-three".