105087221 has 2 divisors, whose sum is σ = 105087222. Its totient is φ = 105087220.

The previous prime is 105087193. The next prime is 105087337. The reversal of 105087221 is 122780501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65836996 + 39250225 = 8114^2 + 6265^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105087221 is a prime.

It is a super-2 number, since 2×105087221² = 22086648035005682, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (105087121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52543610 + 52543611.

It is an arithmetic number, because the mean of its divisors is an integer number (52543611).

Almost surely, 2^105087221 is an apocalyptic number.

105087221 is the 5480-th centered heptagonal number.

It is an amenable number.

105087221 is a deficient number, since it is larger than the sum of its proper divisors (1).

105087221 is an equidigital number, since it uses as much as digits as its factorization.

105087221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 105087221 is about 10251.2058315107. The cubic root of 105087221 is about 471.8999910803.

The spelling of 105087221 in words is "one hundred five million, eighty-seven thousand, two hundred twenty-one".