221315500540 has 24 divisors (see below), whose sum is σ = 469274813280. Its totient is φ = 87666721728.

The previous prime is 221315500529. The next prime is 221315500559. The reversal of 221315500540 is 45005513122.

It is a junction number, because it is equal to n+sod(n) for n = 221315500499 and 221315500508.

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, 53715295 + ... + 53719414.

It is an arithmetic number, because the mean of its divisors is an integer number (19553117220).

Almost surely, 2^221315500540 is an apocalyptic number.

221315500540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221315500540 is an abundant number, since it is smaller than the sum of its proper divisors (247959312740).

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

221315500540 is a wasteful number, since it uses less digits than its factorization.

221315500540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107434821 (or 107434819 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The spelling of 221315500540 in words is "two hundred twenty-one billion, three hundred fifteen million, five hundred thousand, five hundred forty".