21894946273 has 2 divisors, whose sum is σ = 21894946274. Its totient is φ = 21894946272.

The previous prime is 21894946237. The next prime is 21894946309. The reversal of 21894946273 is 37264949812.

Together with previous prime (21894946237) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (21894946237) and next prime (21894946309).

It can be written as a sum of positive squares in only one way, i.e., 20030174784 + 1864771489 = 141528^2 + 43183^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21894946273 is a prime.

It is not a weakly prime, because it can be changed into another prime (21894946573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10947473136 + 10947473137.

It is an arithmetic number, because the mean of its divisors is an integer number (10947473137).

Almost surely, 2^21894946273 is an apocalyptic number.

It is an amenable number.

21894946273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21894946273 is an equidigital number, since it uses as much as digits as its factorization.

21894946273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5225472, while the sum is 55.

The spelling of 21894946273 in words is "twenty-one billion, eight hundred ninety-four million, nine hundred forty-six thousand, two hundred seventy-three".