21060073 has 2 divisors, whose sum is σ = 21060074. Its totient is φ = 21060072.

The previous prime is 21060049. The next prime is 21060077. The reversal of 21060073 is 37006012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20684304 + 375769 = 4548^2 + 613^2 .

It is a cyclic number.

It is not a de Polignac number, because 21060073 - 2¹⁷ = 20929001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21060073.

It is not a weakly prime, because it can be changed into another prime (21060077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10530036 + 10530037.

It is an arithmetic number, because the mean of its divisors is an integer number (10530037).

Almost surely, 2^21060073 is an apocalyptic number.

It is an amenable number.

21060073 is a deficient number, since it is larger than the sum of its proper divisors (1).

21060073 is an equidigital number, since it uses as much as digits as its factorization.

21060073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 21060073 is about 4589.1255158254. The cubic root of 21060073 is about 276.1552415525.

Adding to 21060073 its reverse (37006012), we get a palindrome (58066085).

The spelling of 21060073 in words is "twenty-one million, sixty thousand, seventy-three".