21860675009 has 2 divisors, whose sum is σ = 21860675010. Its totient is φ = 21860675008.

The previous prime is 21860674993. The next prime is 21860675021. The reversal of 21860675009 is 90057606812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16263390784 + 5597284225 = 127528^2 + 74815^2 .

It is a cyclic number.

It is not a de Polignac number, because 21860675009 - 2⁴ = 21860674993 is a prime.

It is a super-2 number, since 2×21860675009² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21860675509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10930337504 + 10930337505.

It is an arithmetic number, because the mean of its divisors is an integer number (10930337505).

Almost surely, 2^21860675009 is an apocalyptic number.

It is an amenable number.

21860675009 is a deficient number, since it is larger than the sum of its proper divisors (1).

21860675009 is an equidigital number, since it uses as much as digits as its factorization.

21860675009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 21860675009 in words is "twenty-one billion, eight hundred sixty million, six hundred seventy-five thousand, nine".