221481063457 has 2 divisors, whose sum is σ = 221481063458. Its totient is φ = 221481063456.

The previous prime is 221481063449. The next prime is 221481063473. The reversal of 221481063457 is 754360184122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191985061921 + 29496001536 = 438161^2 + 171744^2 .

It is a cyclic number.

It is not a de Polignac number, because 221481063457 - 2³ = 221481063449 is a prime.

It is a super-2 number, since 2×221481063457² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221481063757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110740531728 + 110740531729.

It is an arithmetic number, because the mean of its divisors is an integer number (110740531729).

Almost surely, 2^221481063457 is an apocalyptic number.

It is an amenable number.

221481063457 is a deficient number, since it is larger than the sum of its proper divisors (1).

221481063457 is an equidigital number, since it uses as much as digits as its factorization.

221481063457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 322560, while the sum is 43.

The spelling of 221481063457 in words is "two hundred twenty-one billion, four hundred eighty-one million, sixty-three thousand, four hundred fifty-seven".