221365730540 has 24 divisors (see below), whose sum is σ = 485079688800. Its totient is φ = 84696453248.

The previous prime is 221365730539. The next prime is 221365730543. The reversal of 221365730540 is 45037563122.

It is a junction number, because it is equal to n+sod(n) for n = 221365730494 and 221365730503.

It is not an unprimeable number, because it can be changed into a prime (221365730543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240614465 + ... + 240615384.

It is an arithmetic number, because the mean of its divisors is an integer number (20211653700).

Almost surely, 2^221365730540 is an apocalyptic number.

221365730540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221365730540 is an abundant number, since it is smaller than the sum of its proper divisors (263713958260).

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

221365730540 is a wasteful number, since it uses less digits than its factorization.

221365730540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481229881 (or 481229879 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 38.

The spelling of 221365730540 in words is "two hundred twenty-one billion, three hundred sixty-five million, seven hundred thirty thousand, five hundred forty".