21374336147533 has 2 divisors, whose sum is σ = 21374336147534. Its totient is φ = 21374336147532.

The previous prime is 21374336147473. The next prime is 21374336147569. The reversal of 21374336147533 is 33574163347312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12994857006244 + 8379479141289 = 3604838^2 + 2894733^2 .

It is a cyclic number.

It is not a de Polignac number, because 21374336147533 - 2¹⁷ = 21374336016461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21374336147933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10687168073766 + 10687168073767.

It is an arithmetic number, because the mean of its divisors is an integer number (10687168073767).

Almost surely, 2^{21374336147533} is an apocalyptic number.

It is an amenable number.

21374336147533 is a deficient number, since it is larger than the sum of its proper divisors (1).

21374336147533 is an equidigital number, since it uses as much as digits as its factorization.

21374336147533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11430720, while the sum is 52.

The spelling of 21374336147533 in words is "twenty-one trillion, three hundred seventy-four billion, three hundred thirty-six million, one hundred forty-seven thousand, five hundred thirty-three".