10521491857 has 2 divisors, whose sum is σ = 10521491858. Its totient is φ = 10521491856.

The previous prime is 10521491843. The next prime is 10521491867. The reversal of 10521491857 is 75819412501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7347746961 + 3173744896 = 85719^2 + 56336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10521491857 is a prime.

It is a super-2 number, since 2×10521491857² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10521491867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5260745928 + 5260745929.

It is an arithmetic number, because the mean of its divisors is an integer number (5260745929).

Almost surely, 2^10521491857 is an apocalyptic number.

It is an amenable number.

10521491857 is a deficient number, since it is larger than the sum of its proper divisors (1).

10521491857 is an equidigital number, since it uses as much as digits as its factorization.

10521491857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 43.

The spelling of 10521491857 in words is "ten billion, five hundred twenty-one million, four hundred ninety-one thousand, eight hundred fifty-seven".