21078529133 has 2 divisors, whose sum is σ = 21078529134. Its totient is φ = 21078529132.

The previous prime is 21078529127. The next prime is 21078529151. The reversal of 21078529133 is 33192587012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21035731369 + 42797764 = 145037^2 + 6542^2 .

It is a cyclic number.

It is not a de Polignac number, because 21078529133 - 2⁴ = 21078529117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21078529103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10539264566 + 10539264567.

It is an arithmetic number, because the mean of its divisors is an integer number (10539264567).

Almost surely, 2^21078529133 is an apocalyptic number.

It is an amenable number.

21078529133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21078529133 is an equidigital number, since it uses as much as digits as its factorization.

21078529133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 21078529133 in words is "twenty-one billion, seventy-eight million, five hundred twenty-nine thousand, one hundred thirty-three".