21150012162673 has 2 divisors, whose sum is σ = 21150012162674. Its totient is φ = 21150012162672.

The previous prime is 21150012162661. The next prime is 21150012162709. The reversal of 21150012162673 is 37626121005112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13571509706209 + 7578502456464 = 3683953^2 + 2752908^2 .

It is a cyclic number.

It is not a de Polignac number, because 21150012162673 - 2⁴¹ = 18950988907121 is a prime.

It is a super-2 number, since 2×21150012162673² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21150012762673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10575006081336 + 10575006081337.

It is an arithmetic number, because the mean of its divisors is an integer number (10575006081337).

Almost surely, 2^{21150012162673} is an apocalyptic number.

It is an amenable number.

21150012162673 is a deficient number, since it is larger than the sum of its proper divisors (1).

21150012162673 is an equidigital number, since it uses as much as digits as its factorization.

21150012162673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 37.

Adding to 21150012162673 its reverse (37626121005112), we get a palindrome (58776133167785).

The spelling of 21150012162673 in words is "twenty-one trillion, one hundred fifty billion, twelve million, one hundred sixty-two thousand, six hundred seventy-three".