221530768240 has 40 divisors (see below), whose sum is σ = 515168330688. Its totient is φ = 88593504000.

The previous prime is 221530768231. The next prime is 221530768253. The reversal of 221530768240 is 42867035122.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 221530768193 and 221530768202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88654 + ... + 671506.

Almost surely, 2^221530768240 is an apocalyptic number.

221530768240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221530768240 is an abundant number, since it is smaller than the sum of its proper divisors (293637562448).

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

221530768240 is a wasteful number, since it uses less digits than its factorization.

221530768240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587617 (or 587611 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 221530768240 in words is "two hundred twenty-one billion, five hundred thirty million, seven hundred sixty-eight thousand, two hundred forty".