21043533341 has 2 divisors, whose sum is σ = 21043533342. Its totient is φ = 21043533340.

The previous prime is 21043533337. The next prime is 21043533431. The reversal of 21043533341 is 14333534012.

Together with next prime (21043533431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14458860025 + 6584673316 = 120245^2 + 81146^2 .

It is a cyclic number.

It is not a de Polignac number, because 21043533341 - 2² = 21043533337 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21043533311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10521766670 + 10521766671.

It is an arithmetic number, because the mean of its divisors is an integer number (10521766671).

Almost surely, 2^21043533341 is an apocalyptic number.

It is an amenable number.

21043533341 is a deficient number, since it is larger than the sum of its proper divisors (1).

21043533341 is an equidigital number, since it uses as much as digits as its factorization.

21043533341 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 29.

The spelling of 21043533341 in words is "twenty-one billion, forty-three million, five hundred thirty-three thousand, three hundred forty-one".