221646263536321 has 16 divisors (see below), whose sum is σ = 239328420889600. Its totient is φ = 204054467355648.

The previous prime is 221646263536297. The next prime is 221646263536337. The reversal of 221646263536321 is 123635362646122.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-221646263536321 is a prime.

It is a super-2 number, since 2×221646263536321² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221646263536921) 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, 587893345 + ... + 588270241.

It is an arithmetic number, because the mean of its divisors is an integer number (14958026305600).

Almost surely, 2^{221646263536321} is an apocalyptic number.

It is an amenable number.

221646263536321 is a deficient number, since it is larger than the sum of its proper divisors (17682157353279).

221646263536321 is a wasteful number, since it uses less digits than its factorization.

221646263536321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496648.

The product of its digits is 11197440, while the sum is 52.

The spelling of 221646263536321 in words is "two hundred twenty-one trillion, six hundred forty-six billion, two hundred sixty-three million, five hundred thirty-six thousand, three hundred twenty-one".