221643520530 has 32 divisors (see below), whose sum is σ = 539231364864. Its totient is φ = 58295281536.

The previous prime is 221643520523. The next prime is 221643520541. The reversal of 221643520530 is 35025346122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221643520491 and 221643520500.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50601354 + ... + 50605733.

It is an arithmetic number, because the mean of its divisors is an integer number (16850980152).

Almost surely, 2^221643520530 is an apocalyptic number.

221643520530 is an abundant number, since it is smaller than the sum of its proper divisors (317587844334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221643520530 is a wasteful number, since it uses less digits than its factorization.

221643520530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101207170.

The product of its (nonzero) digits is 43200, while the sum is 33.

Adding to 221643520530 its reverse (35025346122), we get a palindrome (256668866652).

The spelling of 221643520530 in words is "two hundred twenty-one billion, six hundred forty-three million, five hundred twenty thousand, five hundred thirty".