21035332541 has 2 divisors, whose sum is σ = 21035332542. Its totient is φ = 21035332540.

The previous prime is 21035332511. The next prime is 21035332543. The reversal of 21035332541 is 14523353012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12672230041 + 8363102500 = 112571^2 + 91450^2 .

It is a cyclic number.

It is not a de Polignac number, because 21035332541 - 2⁶ = 21035332477 is a prime.

It is a super-2 number, since 2×21035332541² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 21035332543, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21035332543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10517666270 + 10517666271.

It is an arithmetic number, because the mean of its divisors is an integer number (10517666271).

Almost surely, 2^21035332541 is an apocalyptic number.

It is an amenable number.

21035332541 is a deficient number, since it is larger than the sum of its proper divisors (1).

21035332541 is an equidigital number, since it uses as much as digits as its factorization.

21035332541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 21035332541 its reverse (14523353012), we get a palindrome (35558685553).

The spelling of 21035332541 in words is "twenty-one billion, thirty-five million, three hundred thirty-two thousand, five hundred forty-one".