221430630505775 has 24 divisors (see below), whose sum is σ = 274639667248800. Its totient is φ = 177102131996160.

The previous prime is 221430630505769. The next prime is 221430630505781. The reversal of 221430630505775 is 577505036034122.

It is an interprime number because it is at equal distance from previous prime (221430630505769) and next prime (221430630505781).

It is not a de Polignac number, because 221430630505775 - 2³⁰ = 221429556763951 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1938932126 + ... + 1939046324.

It is an arithmetic number, because the mean of its divisors is an integer number (11443319468700).

Almost surely, 2^{221430630505775} is an apocalyptic number.

221430630505775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

221430630505775 is a deficient number, since it is larger than the sum of its proper divisors (53209036743025).

221430630505775 is a wasteful number, since it uses less digits than its factorization.

221430630505775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132083 (or 132078 counting only the distinct ones).

The product of its (nonzero) digits is 5292000, while the sum is 50.

Adding to 221430630505775 its reverse (577505036034122), we get a palindrome (798935666539897).

The spelling of 221430630505775 in words is "two hundred twenty-one trillion, four hundred thirty billion, six hundred thirty million, five hundred five thousand, seven hundred seventy-five".