21570094453 has 2 divisors, whose sum is σ = 21570094454. Its totient is φ = 21570094452.

The previous prime is 21570094421. The next prime is 21570094457. The reversal of 21570094453 is 35449007512.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16096758129 + 5473336324 = 126873^2 + 73982^2 .

It is a cyclic number.

It is not a de Polignac number, because 21570094453 - 2⁵ = 21570094421 is a prime.

It is a super-2 number, since 2×21570094453² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21570094457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10785047226 + 10785047227.

It is an arithmetic number, because the mean of its divisors is an integer number (10785047227).

Almost surely, 2^21570094453 is an apocalyptic number.

It is an amenable number.

21570094453 is a deficient number, since it is larger than the sum of its proper divisors (1).

21570094453 is an equidigital number, since it uses as much as digits as its factorization.

21570094453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 21570094453 in words is "twenty-one billion, five hundred seventy million, ninety-four thousand, four hundred fifty-three".