21190528553 has 2 divisors, whose sum is σ = 21190528554. Its totient is φ = 21190528552.

The previous prime is 21190528517. The next prime is 21190528621. The reversal of 21190528553 is 35582509112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11069564944 + 10120963609 = 105212^2 + 100603^2 .

It is a cyclic number.

It is not a de Polignac number, because 21190528553 - 2¹⁴ = 21190512169 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21190528553.

It is not a weakly prime, because it can be changed into another prime (21130528553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10595264276 + 10595264277.

It is an arithmetic number, because the mean of its divisors is an integer number (10595264277).

Almost surely, 2^21190528553 is an apocalyptic number.

It is an amenable number.

21190528553 is a deficient number, since it is larger than the sum of its proper divisors (1).

21190528553 is an equidigital number, since it uses as much as digits as its factorization.

21190528553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108000, while the sum is 41.

The spelling of 21190528553 in words is "twenty-one billion, one hundred ninety million, five hundred twenty-eight thousand, five hundred fifty-three".