221620050540 has 96 divisors (see below), whose sum is σ = 787982415360. Its totient is φ = 50656010688.

The previous prime is 221620050529. The next prime is 221620050607. The reversal of 221620050540 is 45050026122.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29311042 + ... + 29318601.

It is an arithmetic number, because the mean of its divisors is an integer number (8208150160).

Almost surely, 2^221620050540 is an apocalyptic number.

221620050540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221620050540 is an abundant number, since it is smaller than the sum of its proper divisors (566362364820).

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

221620050540 is a wasteful number, since it uses less digits than its factorization.

221620050540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58629668 (or 58629660 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 221620050540 its reverse (45050026122), we get a palindrome (266670076662).

The spelling of 221620050540 in words is "two hundred twenty-one billion, six hundred twenty million, fifty thousand, five hundred forty".