10667521 has 2 divisors, whose sum is σ = 10667522. Its totient is φ = 10667520.

The previous prime is 10667509. The next prime is 10667549. The reversal of 10667521 is 12576601.

It is an a-pointer prime, because the next prime (10667549) can be obtained adding 10667521 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10491121 + 176400 = 3239^2 + 420^2 .

It is a cyclic number.

It is not a de Polignac number, because 10667521 - 2¹⁵ = 10634753 is a prime.

It is a super-2 number, since 2×10667521² = 227592008570882, which contains 22 as substring.

It is equal to p₇₀₅₉₆₁ and since 10667521 and 705961 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10667521.

It is not a weakly prime, because it can be changed into another prime (10667021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5333760 + 5333761.

It is an arithmetic number, because the mean of its divisors is an integer number (5333761).

Almost surely, 2^10667521 is an apocalyptic number.

It is an amenable number.

10667521 is a deficient number, since it is larger than the sum of its proper divisors (1).

10667521 is an equidigital number, since it uses as much as digits as its factorization.

10667521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 10667521 is about 3266.1171136381. The cubic root of 10667521 is about 220.1343600746.

The spelling of 10667521 in words is "ten million, six hundred sixty-seven thousand, five hundred twenty-one".