21570094457 has 2 divisors, whose sum is σ = 21570094458. Its totient is φ = 21570094456.

The previous prime is 21570094453. The next prime is 21570094501. The reversal of 21570094457 is 75449007512.

It is an a-pointer prime, because the next prime (21570094501) can be obtained adding 21570094457 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18490288441 + 3079806016 = 135979^2 + 55496^2 .

It is a cyclic number.

It is not a de Polignac number, because 21570094457 - 2² = 21570094453 is a prime.

It is a super-4 number, since 4×21570094457⁴ (a number of 42 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (21570094453) 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, 10785047228 + 10785047229.

It is an arithmetic number, because the mean of its divisors is an integer number (10785047229).

Almost surely, 2^21570094457 is an apocalyptic number.

It is an amenable number.

21570094457 is a deficient number, since it is larger than the sum of its proper divisors (1).

21570094457 is an equidigital number, since it uses as much as digits as its factorization.

21570094457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 352800, while the sum is 44.

The spelling of 21570094457 in words is "twenty-one billion, five hundred seventy million, ninety-four thousand, four hundred fifty-seven".