21530842252273 has 2 divisors, whose sum is σ = 21530842252274. Its totient is φ = 21530842252272.

The previous prime is 21530842252261. The next prime is 21530842252321. The reversal of 21530842252273 is 37225224803512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18068220952929 + 3462621299344 = 4250673^2 + 1860812^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21530842252273 is a prime.

It is not a weakly prime, because it can be changed into another prime (21530842252373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10765421126136 + 10765421126137.

It is an arithmetic number, because the mean of its divisors is an integer number (10765421126137).

Almost surely, 2^{21530842252273} is an apocalyptic number.

It is an amenable number.

21530842252273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21530842252273 is an equidigital number, since it uses as much as digits as its factorization.

21530842252273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1612800, while the sum is 46.

The spelling of 21530842252273 in words is "twenty-one trillion, five hundred thirty billion, eight hundred forty-two million, two hundred fifty-two thousand, two hundred seventy-three".