221555077651321 has 8 divisors (see below), whose sum is σ = 221672219845824. Its totient is φ = 221437945980720.

The previous prime is 221555077651283. The next prime is 221555077651337. The reversal of 221555077651321 is 123156770555122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221555077651321 - 2²⁹ = 221554540780409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221555077651421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39664906 + ... + 44904508.

It is an arithmetic number, because the mean of its divisors is an integer number (27709027480728).

Almost surely, 2^{221555077651321} is an apocalyptic number.

It is an amenable number.

221555077651321 is a deficient number, since it is larger than the sum of its proper divisors (117142194503).

221555077651321 is a wasteful number, since it uses less digits than its factorization.

221555077651321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5261951.

The product of its (nonzero) digits is 4410000, while the sum is 52.

The spelling of 221555077651321 in words is "two hundred twenty-one trillion, five hundred fifty-five billion, seventy-seven million, six hundred fifty-one thousand, three hundred twenty-one".