194824628221 has 2 divisors, whose sum is σ = 194824628222. Its totient is φ = 194824628220.

The previous prime is 194824628213. The next prime is 194824628239. The reversal of 194824628221 is 122826428491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160008800121 + 34815828100 = 400011^2 + 186590^2 .

It is a cyclic number.

It is not a de Polignac number, because 194824628221 - 2³ = 194824628213 is a prime.

It is a super-2 number, since 2×194824628221² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194824628281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97412314110 + 97412314111.

It is an arithmetic number, because the mean of its divisors is an integer number (97412314111).

Almost surely, 2^194824628221 is an apocalyptic number.

It is an amenable number.

194824628221 is a deficient number, since it is larger than the sum of its proper divisors (1).

194824628221 is an equidigital number, since it uses as much as digits as its factorization.

194824628221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 884736, while the sum is 49.

The spelling of 194824628221 in words is "one hundred ninety-four billion, eight hundred twenty-four million, six hundred twenty-eight thousand, two hundred twenty-one".