221660263321253 has 16 divisors (see below), whose sum is σ = 233636034672000. Its totient is φ = 209715496863552.

The previous prime is 221660263321213. The next prime is 221660263321331. The reversal of 221660263321253 is 352123362066122.

It is a cyclic number.

It is not a de Polignac number, because 221660263321253 - 2²⁰ = 221660262272677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221660263321213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131296376 + ... + 132973902.

It is an arithmetic number, because the mean of its divisors is an integer number (14602252167000).

Almost surely, 2^{221660263321253} is an apocalyptic number.

It is an amenable number.

221660263321253 is a deficient number, since it is larger than the sum of its proper divisors (11975771350747).

221660263321253 is a wasteful number, since it uses less digits than its factorization.

221660263321253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686764.

The product of its (nonzero) digits is 933120, while the sum is 44.

The spelling of 221660263321253 in words is "two hundred twenty-one trillion, six hundred sixty billion, two hundred sixty-three million, three hundred twenty-one thousand, two hundred fifty-three".