21356211419533 has 2 divisors, whose sum is σ = 21356211419534. Its totient is φ = 21356211419532.

The previous prime is 21356211419393. The next prime is 21356211419551. The reversal of 21356211419533 is 33591411265312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19603269843364 + 1752941576169 = 4427558^2 + 1323987^2 .

It is a cyclic number.

It is not a de Polignac number, because 21356211419533 - 2²¹ = 21356209322381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21356211419563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10678105709766 + 10678105709767.

It is an arithmetic number, because the mean of its divisors is an integer number (10678105709767).

Almost surely, 2^{21356211419533} is an apocalyptic number.

It is an amenable number.

21356211419533 is a deficient number, since it is larger than the sum of its proper divisors (1).

21356211419533 is an equidigital number, since it uses as much as digits as its factorization.

21356211419533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 583200, while the sum is 46.

The spelling of 21356211419533 in words is "twenty-one trillion, three hundred fifty-six billion, two hundred eleven million, four hundred nineteen thousand, five hundred thirty-three".