221321454486757 has 2 divisors, whose sum is σ = 221321454486758. Its totient is φ = 221321454486756.

The previous prime is 221321454486721. The next prime is 221321454486817. The reversal of 221321454486757 is 757684454123122.

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., 130940097724836 + 90381356761921 = 11442906^2 + 9506911^2 .

It is a cyclic number.

It is not a de Polignac number, because 221321454486757 - 2³⁹ = 220771698672869 is a prime.

It is a super-2 number, since 2×221321454486757² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221321454486695 and 221321454486704.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221321455486757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110660727243378 + 110660727243379.

It is an arithmetic number, because the mean of its divisors is an integer number (110660727243379).

Almost surely, 2^{221321454486757} is an apocalyptic number.

It is an amenable number.

221321454486757 is a deficient number, since it is larger than the sum of its proper divisors (1).

221321454486757 is an equidigital number, since it uses as much as digits as its factorization.

221321454486757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90316800, while the sum is 61.

The spelling of 221321454486757 in words is "two hundred twenty-one trillion, three hundred twenty-one billion, four hundred fifty-four million, four hundred eighty-six thousand, seven hundred fifty-seven".