21630223000493 has 2 divisors, whose sum is σ = 21630223000494. Its totient is φ = 21630223000492.

The previous prime is 21630223000483. The next prime is 21630223000549. The reversal of 21630223000493 is 39400032203612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19561495974244 + 2068727026249 = 4422838^2 + 1438307^2 .

It is a cyclic number.

It is not a de Polignac number, because 21630223000493 - 2¹² = 21630222996397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21630223000483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10815111500246 + 10815111500247.

It is an arithmetic number, because the mean of its divisors is an integer number (10815111500247).

Almost surely, 2^{21630223000493} is an apocalyptic number.

It is an amenable number.

21630223000493 is a deficient number, since it is larger than the sum of its proper divisors (1).

21630223000493 is an equidigital number, since it uses as much as digits as its factorization.

21630223000493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 35.

The spelling of 21630223000493 in words is "twenty-one trillion, six hundred thirty billion, two hundred twenty-three million, four hundred ninety-three", and thus it is an aban number.