221297408653 has 2 divisors, whose sum is σ = 221297408654. Its totient is φ = 221297408652.

The previous prime is 221297408639. The next prime is 221297408699. The reversal of 221297408653 is 356804792122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221293094724 + 4313929 = 470418^2 + 2077^2 .

It is a cyclic number.

It is not a de Polignac number, because 221297408653 - 2⁵ = 221297408621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221297408597 and 221297408606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221297403653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110648704326 + 110648704327.

It is an arithmetic number, because the mean of its divisors is an integer number (110648704327).

It is a 2-persistent number, because it is pandigital, and so is 2⋅221297408653 = 442594817306, but 3⋅221297408653 = 663892225959 is not.

Almost surely, 2^221297408653 is an apocalyptic number.

It is an amenable number.

221297408653 is a deficient number, since it is larger than the sum of its proper divisors (1).

221297408653 is an equidigital number, since it uses as much as digits as its factorization.

221297408653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 221297408653 in words is "two hundred twenty-one billion, two hundred ninety-seven million, four hundred eight thousand, six hundred fifty-three".