221457502004461 has 2 divisors, whose sum is σ = 221457502004462. Its totient is φ = 221457502004460.

The previous prime is 221457502004447. The next prime is 221457502004521. The reversal of 221457502004461 is 164400205754122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221105182595236 + 352319409225 = 14869606^2 + 593565^2 .

It is a cyclic number.

It is not a de Polignac number, because 221457502004461 - 2⁵ = 221457502004429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221457502004441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110728751002230 + 110728751002231.

It is an arithmetic number, because the mean of its divisors is an integer number (110728751002231).

Almost surely, 2^{221457502004461} is an apocalyptic number.

It is an amenable number.

221457502004461 is a deficient number, since it is larger than the sum of its proper divisors (1).

221457502004461 is an equidigital number, since it uses as much as digits as its factorization.

221457502004461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 537600, while the sum is 43.

Adding to 221457502004461 its reverse (164400205754122), we get a palindrome (385857707758583).

The spelling of 221457502004461 in words is "two hundred twenty-one trillion, four hundred fifty-seven billion, five hundred two million, four thousand, four hundred sixty-one".