221335533540 has 72 divisors (see below), whose sum is σ = 732419408448. Its totient is φ = 53657098560.

The previous prime is 221335533521. The next prime is 221335533577. The reversal of 221335533540 is 45335533122.

221335533540 is a `hidden beast` number, since 2 + 2 + 1 + 33 + 55 + 33 + 540 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 221335533495 and 221335533504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55890832 + ... + 55894791.

It is an arithmetic number, because the mean of its divisors is an integer number (10172491784).

Almost surely, 2^221335533540 is an apocalyptic number.

221335533540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221335533540 is an abundant number, since it is smaller than the sum of its proper divisors (511083874908).

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

221335533540 is a wasteful number, since it uses less digits than its factorization.

221335533540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111785649 (or 111785644 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 36.

The spelling of 221335533540 in words is "two hundred twenty-one billion, three hundred thirty-five million, five hundred thirty-three thousand, five hundred forty".